Keeping in mind the new JEE admission into IITs is not that a concern but if you lack a bit then NITs are also a good option.So keeping this in mind that admission into NITs will have 40% weightage to normalised class XII marks. As Mr. Dheeraj Sanghi points out in one of his posts
"But a much worse situation is in NIT admission where the two students with the same academic preparation will be at different relative level if they are in two different boards, and will get different normalized marks. The student in the better board will be at a lower relative level within his/her board, and hence will get lower normalized marks and hence would be strongly discriminated against in the admissions to NITs.
If we accept all this, and if this is indeed what is going to continue in 2014 and beyond, then it makes sense for the parents to put their wards in schools which are affiliated to the boards where students have had poorer academic preparation. In particular, this implies that it would be beneficial to join a state board over CBSE for most states. (I am not aware of any state board whose students perform better than students from CBSE schools in various competitive and other independent exams.)
So it would be a better decision to take admission in a board which comprises mainly of rural and government schools so that you can have a better percentile for similar performance. Say in rajasthan it would be prudent to take admission in a RBSE school then a CBSE one.
It sounds absurd first but if you think and analyze it can be a helpful step into shaping your career.