As the scores are low you might not end up being in the college or institute you want to. But, if you do proper research you might at least land in a better place instead of getting admission to the wrong college.

If ever you are skeptical about the eligibility criteria, always check the brochure, it usually contains the eligibility condition which the candidate needs to fulfill.

Moreover, with the latest ISI Brochure, there are no percentage/grade criteria for applying, except if you are applying through GATE score in M.Tech.