If o have 70 percent in my board but in top 20 percentile for iit jee this is useful or i have to class improvement please tell for getting
JEE Main 2025: Rank Predictor | College Predictor | Marks vs Rank vs Percentile
JEE Main 2025: Sample Papers | Syllabus | Mock Tests | PYQs | High Scoring Topics
Apply to TOP B.Tech/BE Entrance exams: VITEEE | MET | AEEE | BITSAT
The minimum percentage to get admission in NIT or IIT is 75 percentage in board exams without this you can surely sit for allotment but you will not pass through the document verification stage hence I advise you not to repeat 12th but to apply for private colleges like Bits and Amity which accept JEE main scores. Also you can try for local government colleges in your home state itself.
Good Luck!!

JEE Main 2025 College Predictor
Know your college admission chances in NITs, IIITs and CFTIs, many States/ Institutes based on your JEE Main result by using JEE Main 2025 College Predictor.