If I scored only 46% in 12 science ?what I want to do(reapply for 12)?My guardian suggest me to do GNM?
Based upon your fetched percentage in the Class 12th board exam you won't be able to do anything with your career either the good College / placements / apply for the any Government exam , so as you said your guardian is asking to repeat it again so i will also suggest you the same for you such that you can be able to something good with your career.
All the best
Good luck
But there's nothing to worry there are dozens of course you can pursue with you percentage.
Good luck :)