Hey  here is your answer

1. 78 percentile in TANCET is a reasonable score for an SC candidate.

2. Many colleges have lower cutoffs for SC category, usually around 60-75 percentile.

3. 78 percentile gives you a good chance for admission in decent MBA colleges.

4. You should apply during the TANCET counselling.

5. Be prepared with all required documents for the counselling process.

6. SC candidates often have reserved seats, which improves chances of admission.

For more details you can visit the link given below

https://bschool.careers360.com/articles/tancet-mba-colleges-90-percentile-cutoff