hi,

see cutoff score varies every year and it depends on certain factors like number of applicant, questions difficulty level, seat matrix, students category, choice of stream etc. however I suggest you to apply for sastra and as well as other university since cutoff score varies every year. so it is difficult to predict the exact stream based on your score only.

now coming to the stream choice every stream has its own benefits and work opportunities. however cse IT are mainly maths and programming subjects, however ece stream based on physics, maths programming. between IT and ece , ece syllabus is bigger and comparatively tough as per students review. so if you are inclined towards cse, than you should Take b.tech in IT, in place of cse for non availability of cse. THE SYLLABUS FOR  cse and IT are quite same and work opportunity is best in India as well as abroad.

hope it would help.