There is no such thing like a stipend for clearing TANCET, as far as I know. But you can see the difference in fee structure. Fee payment in colleges through TANCET will be comparatively low when compared with National level exams.
Since the past few years, TANCET is really competitive. If you score well and get a counseling call on the very first day on the first or second batch, you will get a seat in top colleges in TN. Seats will be rarely available on the second day of counseling. So, clear TANCET with high scores.
All the best
You can also check
http://entrance-exam.net/forum/general-discussion/there-any-scholarships-available-through-tancet-do-m-e-government-government-aided-self-funded-engineering-colleges-tamilnadu-137872.html
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