Subjects must have blood pressure (BP) no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; initiation or adjustment of BP medication is permitted prior to study entry provided that the average of three BP readings at the time of enrollment is =< 140/90 mmHg 55.0 Patients must have blood pressure (BP) no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; initiation or adjustment of BP medication is permitted prior to study entry provided that the BP reading prior to enrollment is no greater than 140/90 mmHg 70.0 No grade 3 or 4 hypertension (systolic blood pressure [BP] > 160 and or diastolic BP > 100) that cannot be controlled with medication prior to registration 34.0 Poorly-controlled hypertension as defined blood pressure (BP) > 150/100 mmHg, or systolic (S) BP > 180 mmHg when diastolic (D) BP < 90 mmHg, on at least 2 repeated determinations on separate days within 3 months prior to study enrollment 36.0 Uncontrolled hypertension defined as sustained systolic blood pressure (BP) > 150 mmHg or diastolic BP > 90 mmHg; (patients with initial BP elevations are eligible if initiation or adjustment of BP medication lowers pressure to meet entry criteria) 990.0 Patients must have adequately controlled blood pressure (BP), with a BP no greater than 140 mmHg (systolic) and 90 mmHg (diastolic) for eligibility; patients must have a BP of =< 140/90 mmHg taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of three antihypertensive medications; it is strongly recommended that patients who are on three antihypertensive medications be followed by a cardiologist or blood pressure specialist for management of blood pressure while on protocol 549.0 Adequately controlled blood pressure (systolic blood pressure [SBP] =< 140; diastolic blood pressure [DBP] =< 90 mmHg) on maximum of three antihypertensive medications; patients must have a BP of =< 140/90 mmHg taken in the clinic setting by a medical professional within 2 weeks prior to starting study; it is strongly recommended that patients who are on three antihypertensive medications must be actively followed by a cardiologist or a primary care physician for management of BP while on protocol; patients must be willing and able to check and record daily blood pressure readings; blood pressure cuffs will be provided to patients randomized to cediranib alone and the combination of olaparib and cediranib arms 680.0 A blood pressure (BP) =< the 95th percentile for age, height, and gender, and not receiving medication for treatment of hypertension; please note that 3 serial blood pressures should be obtained and averaged to determine baseline BP 67.0 Adequately controlled blood pressure (BP) < 140 mmHg (systolic) and < 90 mmHg (diastolic) taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of 3 antihypertensive medications; patients who are on 3 antihypertensive medications are highly recommended to be followed by a cardiologist or blood pressure specialist for management of BP while on protocol 126.0 No history of the following* Prior brain metastases* Leptomeningeal disease* Seizures* Class 3 or 4 congestive heart failure* Uncontrolled hypertension (systolic blood pressure [BP] > 170 mmHg or diastolic BP > 105 mmHg) despite optimal medical management* Major surgery =< 4 weeks of registration 45.0 A blood pressure (BP) =< the 95th percentile for age, height, and gender for pediatric patients < 18 years old and =< 140/90 mmHg for patients >= 18 years old; patients should not be receiving medication for treatment of hypertension (except patients with Wilms tumor and RCC who may be eligible if on stable doses of no more than one anti-hypertensive medication with a baseline BP =< ULN for pediatric patients and =< 140/90 for adult patients); please note that 3 serial blood pressures should be obtained and averaged to determine baseline BP 146.0 Adequately controlled blood pressure (BP) < 140 mmHg (systolic) and < 90 mmHg (diastolic) taken in the clinic setting by a medical professional within 2 weeks prior to starting study; patients with hypertension may be managed with up to a maximum of 3 antihypertensive medications; patients who are on 3 antihypertensive medications are highly recommended to be followed by a cardiologist or blood pressure specialist for management of BP while on protocol 90.0 Adequately controlled blood pressure; (defined as systolic blood pressure [SBP] of < 140 mmHg and diastolic blood pressure [DBP] of < 90 mmHg) on maximum of three antihypertensive medications; participants must have a blood pressure (BP) of < 140/90 taken in the clinic or hospital setting by a medical professional within 2 weeks prior to starting on study; it is strongly recommended that participants who are on 3 antihypertensive medications be followed by a cardiologist or a primary care physician for management of BP while on study 132.0 Participants may not have any evidence of ongoing inadequately controlled hypertension (defined as a systolic blood pressure [BP] of > 140 mmHg or a diastolic BP of > 90 mmHg); patients with hypertension may not be on more than three antihypertensive medications for management of their blood pressure (medications that combine two anti-hypertensives into one are considered as two medications); it is strongly recommended that patients who require three antihypertensive medications for baseline management of pre-existing hypertension be actively followed by a cardiologist or blood pressure specialist for management of BP while on protocol 70.0 Patients with systolic blood pressure (SBP) >= 140 mmHg or diastolic blood pressure (DBP) >= 90 mmHg at the screening visit are ineligible; patients with an initial clinic blood pressure (BP) >= 140/90 mmHg may be included if SBP < 140 mmHg and DBP < 90 mmHg is confirmed in two subsequent BP measurements on the same day 30.0 Patients with BP combination treatment with more than two antihypertensive medications are ineligible 30.0 A blood pressure (BP) =< the 95th percentile for age, height, and gender measured within 7 days prior to enrollment; please note that 3 serial blood pressures should be obtained and averaged to determine baseline BP; patients with hypertension controlled on antihypertensive medications will be allowed if otherwise eligible 49.0 Inadequately controlled hypertension (systolic blood pressure of > 150 mmHg or diastolic pressure > 100 mmHg on anti-hypertensive medications) 48.0 Uncontrolled blood pressure and hypertension: systolic blood pressure (SBP) > 140 mm Hg or diastolic blood pressure (DBP) > 90 mm Hg within 14 days prior to registration; patients are permitted to be receiving multiple anti-hypertensive medications (unless otherwise indicated in the study); all blood pressure measurements within the 14 days prior to registration and on day 1 of cycle 1 must be SBP =< 140 and DBP =< 90; an exception can be made by a healthcare provider for a patient with a single blood pressure elevation who upon rechecking has a normal blood pressure 130.0 Hypertension:* Patients, 3-17 years of age must have a blood pressure that is =< 95th percentile for age, height and gender at the time of registration** The normal blood pressure by height, age and gender tables can be accessed in the Generic Forms section of the Pediatric Brain Tumor Consortium (PBTC) members� webpage* Patients who are >= 18 years of age must have a blood pressure that is < 140/90 mm of Hg at the time of registration* Note: if a blood pressure (BP) reading prior to registration is above the 95th percentile for age, height and gender it must be rechecked and documented to be =< the 95th percentile for age, height and gender prior to patient registration 180.0 Patients must not have uncontrolled hypertension (defined as systolic blood pressure > 140 mm Hg and/or diastolic blood pressure > 90 mm Hg which cannot be controlled by anti-hypertensive therapy) 97.0 Adult patients with hypertension not controlled by medical therapy (hypertension defined as systolic blood pressure > 150 mmHg or diastolic pressure > 90 mmHg despite optimal medical management); pediatric patients must have blood pressure (BP) within normal limits (WNL) for age; NOTE: blood pressure within the upper limit of normal is defined as: blood pressure =< the 95th percentile for age, height, and gender, and not be receiving medication for treatment of hypertension 73.0 Adequate blood pressure defined as:* A blood pressure (BP) =< the 95th percentile for age, height, and gender measured; adequate blood pressure can be achieved using medication for treatment of hypertension 104.0 Patients not achieving adequate blood pressure in spite of antihypertensive therapy for control of blood pressure 104.0 Inability to home monitor blood pressure 12.0 Inadequately controlled hypertension (systolic blood pressure of > 150 mmHg or diastolic pressure > 90 mmHg on anti-hypertensive medications) 44.0 History of uncontrolled hypertension, defined as blood pressure > 150/95 mmHg, or systolic blood pressure > 180 mmHg when diastolic blood pressure < 90 mmHg, on at least 2 repeated determinations on separate days within 3 months prior to study enrollment 57.0 Significant active cardiovascular or pulmonary disease at the time of study entry, including:* Uncontrolled high blood pressure (i.e., systolic blood pressure > 150 mm Hg, diastolic blood pressure > 95 mm Hg)* Pulmonary hypertension* Uncontrolled asthma or oxygen (O2) saturation < 90% by pulse oximetry on room air* Significant valvular disease; severe regurgitation or stenosis by imaging independent of symptom control with medical intervention, or history of valve replacement* Medically significant (symptomatic) bradycardia* History of arrhythmia requiring an implantable cardiac defibrillator 57.0 Uncontrolled high blood pressure (i.e., systolic blood pressure >= 160 mmHg, diastolic blood pressure >= 90 mmHg) 23.0 Patients with uncontrolled hypertension are ineligible; uncontrolled hypertension is defined as follows:* Patients aged =< 17 years: greater than 95th percentile systolic and diastolic blood pressure based on age and height which is not controlled by one anti-hypertensive medication* Patients aged > 17 years: systolic blood pressure >= 140 mmHg and/or diastolic blood pressure >= 90 mmHg that is not controlled by one anti-hypertensive medication 340.0 Participants with uncontrolled sustained hypertension which will be defined as systolic blood pressure > 140, and diastolic blood pressure > 90, even with use of anti-hypertensive medications 42.0 Significant active cardiovascular or pulmonary disease at the time of study entry, including* Uncontrolled high blood pressure (i.e., systolic blood pressure > 180 mm Hg, diastolic blood pressure > 95 mm Hg) * Pulmonary hypertension * Uncontrolled asthma or oxygen (O2) saturation < 90% by ABG (arterial blood gas) analysis or pulse oximetry on room air * Significant valvular disease; severe regurgitation or stenosis by imaging independent of symptom control with medical intervention, or history of valve replacement * Medically significant (symptomatic) bradycardia 209.0 Uncontrolled hypertension (despite medical therapy); blood pressure should be < 140/90 in accordance with American Heart Association definition of hypertension 50.0 Patients must be willing and able to check and record daily blood pressure readings; blood pressure cuffs will be provided to patients randomized to Arm III 549.0 Patients who are receiving anti-hypertensive medications for control of blood pressure at the time of enrollment are not eligible for this trial 67.0 No uncontrolled hypertension (systolic blood pressure =< 160 millimeters of mercury [mmHg] or diastolic =< 100 mmHg); patients with hypertension must be adequately controlled with appropriate anti-hypertensive therapy or diet 130.0 Patients must not have inadequately controlled hypertension; patients must have documented blood pressures of systolic blood pressure (SBP) < 150 and diastolic blood pressure (DBP) < 90 within 14 days of starting randomization; blood pressure medications (any number) are permitted 180.0 Low resting systolic blood pressure: < 90 mmHg 250.0 Use of any other blood pressure lowering medication for treatment of hypertension within 30 days of enrollment except calcium channel blockers and diuretics 250.0 Patients with hypertension on medical management must have systolic blood pressure < 150 mmHG or diastolic pressure < 90 mmHG at study entry 84.0 Patients must be willing and able to check and record daily blood pressure readings when randomized to cediranib containing arm 90.0 Patients with known significant active cardiovascular or pulmonary disease at the time of study entry are INELIGIBLE including:* Uncontrolled hypertension (i.e., systolic blood pressure >180 mm Hg, diastolic blood pressure > 95 mm Hg); use of anti-hypertensive agents to control hypertension before cycle1 day 1 is allowed* Pulmonary hypertension* Uncontrolled asthma or oxygen (O2) saturation < 90% by arterial blood gas analysis or pulse oximetry on room air* QT syndrome, or torsades de pointes* Significant valvular disease; severe regurgitation or stenosis by imaging independent of symptom control with medical intervention, or history of valve replacement* Medically significant (symptomatic) bradycardia* History of arrhythmia requiring an implantable cardiac defibrillator* Baseline prolongation of the rate-corrected QT interval (QTc) (e.g., repeated demonstration of QTc interval > 480 milliseconds, or history of congenital long 40.0 Patients must be willing and able to check and record daily blood pressure readings if receiving cediranib 132.0 Patients with clinically significant cardiovascular disease are excluded* Inadequately controlled hypertension (HTN) (systolic blood pressure [SBP] >= 160 mmHg and/or diastolic blood pressure [DBP] >= 90 mmHg despite antihypertensive medication)* History of cerebrovascular accident (CVA) within 6 months* Myocardial infarction or unstable angina within 6 months* New York Heart Association class II or greater congestive heart failure * Serious and inadequately controlled cardiac arrhythmia* Significant vascular disease (e.g. aortic aneurysm, history of aortic dissection)* Clinically significant peripheral vascular disease 22.0 Patients with clinically significant cardiovascular disease are excluded* Inadequately controlled hypertension (HTN) (systolic blood pressure [SBP] > 160 mmHg and/or diastolic blood pressure [DBP] > 90 mmHg despite antihypertensive medication)* History of cerebrovascular accident (CVA) within 6 months (see additional requirement for adjuvant protocols)* Myocardial infarction or unstable angina within 6 months (see additional requirement for adjuvant protocols)* New York Heart Association grade II or greater congestive heart failure * Serious and inadequately controlled cardiac arrhythmia* Significant vascular disease (e.g. aortic aneurysm, history of aortic dissection)* Clinically significant peripheral vascular disease 98.0