A good percentile in JEE exams depends on several factors, such as the difficulty level of the exam, the number of candidates appearing for the exam, and the competition for the available seats in top engineering colleges. However, generally, a percentile score of 95 or above is considered a good score in JEE Mains. In contrast, a percentile score of 99 or above is considered a good score in JEE Advanced. The cutoff for JEE Advanced and admission to various engineering colleges can vary yearly and from college to college. So, it’s essential to check the latest information on the official website of JEE and the colleges you’re interested in for the most accurate and up-to-date information.