I want to drop out of M.Sc but I still want to give CSIR NET. Is it possible? Can I use CSIR NET scorecard for M.Sc admission?

You can't write CSIR NET without completing M.Sc or being in the final year. The scorecard can't be used for M.Sc admission. It's only for research or lectureship eligibility, not for getting admission into a master's program.