I have completed my BTech with 63% , is it Mandatory to take ISAT or any other entrance tests (CMAT, CAT, MAT)?

Thanks for showing your interest in Imperial, no it is not mandatory to give any of these entrance.

uday it is always better if you tk any entrance exam...there is no harm in doing this instead it will keep your confidence high if u score well...so do appear in ny of the entrance test tht your college of intrest is accepting...