Hello,

You haven't mentioned the name of the board for which you're enquiring about 12th science papers, in case it's CBSE you can check out sample papers of 12th board sample papers of all subjects for science stream at https://school.careers360.com/boards/cbse/cbse-class-12-sample-papers, this will make you acquaint with paper pattern, marking scheme, important topics, weightage etc, through consistent practice you can analyze the level of preparation, and also improve time management skills, speed, and calculation.