Hello,
If you have appeared for boards this year and you have not scored an aggregate of 75 percentage but you have passed all the subjects in which you have the examination, then you can give improvement examination next year in the desired number of subjects in such a way that you get 75 percentage to get admission in NITs, IITs and IIITs.
For admission in BITS, you must have an aggregate of 75 percentage in Physics, Chemistry and Mathematics with an individual score of at least 60 percentage in the three subjects (Physics, Chemistry and Mathematics). If you are giving the improvement examination next year, then please note that you need to give the improvement examination in all the five subjects you appeared for, in order to be eligible to get admission in BITS.
I hope this helps. For any further queries, ask me in the comments.

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