Hi aspirant...!

Hope you're doing great...!

So, with regard of you're query. If you get 200 marks in JEE MAINS. then you will get around 98-98.987 (approx) percentile and you will secure around 10k-20k rank in general category.  the cut off  CSE branch in NIT TRICHY in SC category depends upon the number of students in you're category. if the number of students in you're category scores more than you're marks. they will get a chance before you. So, if you really want a seat in  CSE branch in nit Trichy then, you should get around 250-260. then you'll definitely get a seat.

hope this will helps you...!

GOOD LUCK...!