Taking into account your JEE Mains rank and assuming that your category is general, you might be able to get admission in SASTRA in IT branch but not in CSE.
Some additional information about JEE Mains:
JEE Mains is an annual exam that is conducted by the National Testing Agency and the CBSE for admissions to undergraduate engineering courses in NITs, IIITs, GFTIs and other institutes. It also serves as the first stage for admission to IITs through JEE Advanced.
EWS is a new category that has been created by the MHRD for economically weaker sections. 10% seats will be reserved for those candidates whose annual family income is less than INR 8 lakh per annum.
Follow the below link for more information about JEE Mains
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Follow the below link for JEE Mains cutoffs of various NITs and IIITs: