I am from a middle-class family and will the bank finance me 25 lakhs or whatever be the fees structure for IIM A, B, C or SNAP, NMAT, XAT?

Analytical and Logical Reasoning section of SNAP has maximum weightage of 25 questions and 25 marks. 

Yes, if you are not confident of self study, do take coaching. It is also necessary for complete guidance and periodical analysis of progress and that whether your preparation is going in the right direction or not. 

The question papers of all SNAP sessions are not same. In every attempt and slot, candidates get a different set of questions. Sectional break up and marking scheme are the same for all though. 

Symbiosis Skills and Professional University MBA applicants must track SNAP and MAT dates because these exams happen earlier. If you miss the registration for these national tests, you might lose a chance to apply here. Each exam has its own schedule for registration, hall tickets, and results. You

About 20-30 full-length and sectional mocks will be enough for you to crack SNAP exam with high scores. However, make sure you analyse every mock performance and learn from it.