Actually it cannot be predicted now, how many marks you would need to make it to IISER Trivendram or Pune as it totally depends on the marks obtained by you and other students in JEE Advanced 2019.

As of last year's eligibility criteria a general category candidate must have a rank within 10000 in Common Rank List (CRL) and for reserved category (OBC-NCL, SC, ST, PWD) candidates it should be within 10000 in their respective categories.

I would suggest you to prepare for JEE Advanced rather than worrying about the admissions.

All the best!

Hope this helps!