Can someone get an AIR<100 in IITJEE if he solves all the questions & Excercises of Brilliant tutorials(corresspondence). 

hey ranks can never b predicted--as said by an iitian.....and ur duty is to work hard....n u'll get the desired results accordingly....some ppl cant qualify even after working for 3 yrs....so its upto ur hard work...n understanding of concepts.

k. I was just asking cause I got State Rank 1 in State level NTSE in class X(Goa.) & was wondering whether I shud try to get in the top 100.

See, the thing is that your level at X std. does not matter much. I've seen CBSE toppers not qualify, and I've seen those who were average upto X get under 100. Of course you can try, but don't think you'll definitely get it - it's a matter of luck for most. As for your original question, I think Brilliant Material is a bit insuffucient if you're using only that. You'll need a good test series and lots of books also - here's my list of books: http://www.goiit.com/posts/list/community-shelf-the-jee-guide-72019.htm

Actually I know someone(My Xth Std maths teacher's son- Ralf Silva) who got AIR 25 in IITJEE 2007. He says he only did brilliant's correspondence(hence I chose it), nothing else(not even HCV, no coaching, nothing!!!)