Candidates appearing for JEE Main  must have passed class 12th with Physics, Chemistry & Mathematics in order to apply. However For admission to IITs, NITs, IIITs & CFTIs candidates must have secured at least 75% in their class 12th board exams (65% for SC/ST students). No board marks will be taken into account for calculating JEE Main score from the year 2017 onwards.

Good , u are not eligible.

Because I thought of older period but now it is must to score above 75%. 

But try as u are 74.8%

All the best.

Good, yes u are eligible to write jee main for next year .

All the best