I have secured 62.3% in JEE paper 2, will I secure a seat in any prestigious institute?

Please visit this site https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor&ved=2ahUKEwi98YDt_LvhAhWUF3IKHUDYCF4QFjAAegQIAxAB&usg=AOvVaw1N9BzFtyUCP4JU-2UQHQ0H.

Wait for the result of schedule 2 exam, after that the colleges will fix their cutoff on the basis of JEE Mains result. You can get a good college, if not prestigious, with these marks.