I have just qualified advanced and hopes to get into the iisers ..Is it possible to crack jee during the first year at iiser?I think i lacked speed of attempting question in jee advanced 2015.I wish to correct my mistake for the next time.which books should i refer?

NCERT books are the best sources for it , along with that try to find out some previous year’s question papers and if available some assignments as well to practice......along with doing these things keep conatantly visiting websites of renowned institutions to find out relevant information pertaining to admission....i opine to check out at – SCMS school of engg and tech,Ernakulam,........Bhilai Inst of Tech, Durg,........Jiwaji Uni, Gwalior,......Lovely Professional University, Phagwara