hello harsh..,

it doesnt mean 90 percentile can be the exact cut off mark for the jee mains examination for general category. the expected cutoff for the general category is 89.75. and this is not the exact cutoff percentile declared. the nta will release the cutoff officially later after the next session of jee exam . so this cutoff can vary with respect to the factors of percentile...

hope this information was useful to  you..

all the best for your bright future..