Dear Aspirant,

At a score of 74 marks you have scored 79.95 percentile and this is highly unfortunate as you have already mentioned that you should have scored 91-93 percentile or at least a percentile in 80s.But still there are some processes and information out of our reach.Its basically the scaling process which creates the most impact on your percentile.So if your shift turned out to be low on scaling score and students performed well in your shift then your percentile will definitely have a heavy blow.Also there is a final answer key released after the initial answer key which might have some changes.So after considering all the above aspects of you still feel you have not achieved the desired percentile you can contact the NTA authorities by an email  jeemain@nta.ac.in.So best of luck.

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https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer