HOW MUCH PERCENTILE SHOULD GET IIT'S FOR B.ARCH COURSE ?
You need to qualify the B.Tech/B.E Paper (Paper 1) of JEE Mains and JEE Advanced thereafter, then only you will be able to apply for AAT (Architecture Aptitude Test) which allots B.Arch seats to already-qualified students from JEE Advanced.
Hope this information helps! :)
bhagya a naganur