To be a part of JOSAA you should satisfy least one of the following

One of the criteria for admission to NITs/IIITs/Other participating GFTIs is that the candidate should satisfy at least one of these two criteria: (i) The candidate is within the category-wise top 20 percentile of successful candidates in their respective Class XII (or equivalent) examination of the respective stream and Board. (ii) The candidate has secured minimum 75% (for GEN or OBC-NCL) or minimum 65 % (for SC, ST or PwD) of aggregate marks in the Class XII (or equivalent) examination of respective stream and Board

As you have below 75% marks in the five subjects so you can look for the top 20 percentile of your Board. But Your boards Top 20 Percentile is above your marks

Final Note You are Not eligible. Take other courses.