Hello Aspirant, We cannot exactly predict the percentile as it can differ from paper to paper depending upon the level of paper, As your percentile tells you the percentage of student who scored marks less than or equal to you, so of the paper is easy with 188 marks your percentile will be low but if paper is tough, 188 marks can give you a good percentile but on an average we can say that with 188 marks in JEE Main Paper 1 your percentile can vary from 96 to 98 percentile.