i suggest brilliant self study material ,their young file , and their test series

they go according to current trend in iit

fiitjee they give questions which r far away from iit level their questions look too dificult  ( test series)

i did brilliant course of the above said

and even fitjee tests  , i wasted time foir fit jee thinking that iit level would be such but no

i dont know of allens institute

regards bye