The thing is that till class 10 cbsei is good but after that their are a lot of problems in cbsei for example in class 12 most of whatever you have learned especially in physics wont come in the examination. The physics examination is very very hard and the marking is also very strict and the other problem is English. Cbsei English is way harder than cbse and most of the students loose marks because of English and the English subject is not properly taught by the teachers of cbsei