Princeton as a classes is just a waste of money, this classes are for GRE and all international exams but they don’t provide any kind of guarantee and morover my personal experience is also very bad. I opted for GRE took coaching paid 65K and what I got in return, Nothing! Administration will trick you to take admission in their classes but don’t fall prey to their soft words. Till the time they don’t give guarantee, please don’t join it.