im sorry but wtf kind of question is this? hahha just take one review course...most ppl think princeton is best if you're going for a course. if you study on your own it seems exam krackers is a good source.
save the money and dont do two...you can use princeton and then just purchase more practice exams from them if you need them. they provide good exams that wont show you an inflated score. like in my experience i took like 7 practice princeton exams and got about 21-23 on them. real test i scored a 30 so yah...ive heard the opposite for kaplan. just my opinion and you know how it is...so many diff stories from fellow premeds...good luck