Go for Kothari Mehta & Co. if you can't afford to stucy and clear CA all by yourself. SNB is India's no.1 internal audit firm, but no matter how much you may try to convince them even after working like an bull for them day & night, they wouldn't allow you to have tuitions. Because when you go there to join it its already printed in their application form nice & clearly- NO COACHING CLASSES.
And if you think that after working them for around 1 year or 2 years you will take transfer to a small firm and then clear your exams, then forget it. Because it is also printed on their form:
NO TRANSFERS ALLOWED
NO INDUSTRIAL TRAINING ALLOWED
NO CONVEYANCE ALLOWED
If you can survive all these requirements then definitely go for SNB or else try in Kothari because they might be generous enough to grant you time for tuitions.