TIFR released the answer key of computer and system science paper along with shortlisted candidate list for interview.
Link for answer key: http://univ.tifr.res.in/gs2018/Files/GS2018_QP_CSS.pdf
Shortlisted students list: http://univ.tifr.res.in/gs2018/Test_Results/INT_Shortlist_CSS.htm
If anyone shortlisted for the interview then please comment your marks.
According to answer key my marks is 58 but not selected for the interview.