hi,

see amrita university takes admission in b.tech course based on their own entrance test score or jee main score, however 90.27 percentile is  a decent score, but cutoff score depends on certain factors like number of participants, questions difficulty level, seat matrix, etc. however since computer science is most demanding stream right now it would be best if your score is around 95-98 percentile. so try harder to bring a much better score in jee main july exam.