No, you cannot opt for only Maths exams through NIOS and be eligible for MT CET PCM B.Tech.
You can check out the CAP round 2 cutoff for the different colleges and see which colleges you will be eligible for admission as per the cutoff data.
SVPCET offers admission to its B.Tech programmes through the management quota. The selection of candidates is based on their MHT CET score, academic record, and interview performance. The application process is usually conducted in June or July. The SVPCET fee structure for the management quota seats is slightly higher than the fee structure for the CAP seats.
33 marks in MHT CET is too less for taking admission in B.Tech Electronics and Telecommunication Engineering offered by St.Vincent Pallotti College of Engineering & Technology. In 2022, the cut off for electronics and telecommunication engineering was 37072 (GOPENS), 36762 (LOPENS) etc.