Hello aspirant,

The MNS exam, the questions will be based on 11th and 12th class from the subjects Physics, Chemistry and Biology wholly. So you need to prepare for the exam accordingly from both 11th and 12th. It's not that you will prepare from 12th class Physics, Chemistry and Biology for the exam. You need to prepare from 11th class Physics, Chemistry and Biology as well. Get to know the syllabus so that it will be easy for you to prepare for the examination.

Hope, this answer helps you. Wishing you good luck!