Dear aspirant,

I would say that to get admission in iist irrespective of jee mains you should be focused in jee advanced more as you have to get a very a decent score in jee advanced.

In general if you are capable to go for iist Thiruvananthapuram then you should be able to score a minimum of 96.5 percentile in jee mains.

Coming to jee advanced to clear the cut off for iist a minimum of 40% in jee advanced  is required to take admission .in that college.