Hello Student

For getting good marks in 12th standard examination you have to know the 12th class syllabus very well. Collect the basic text books and reference books also. Collect 10 years previous questions of 12th class in which stream of subjects you are taking for.  Practice the MCQ pattern mock test from the previous years question papers, practice it regularly. Everyday revise the previous days task and tests and question and answer  that related to it. Maitain a time schedule that should be prepared systematically . You should have a leasur time of 2 hours other than 10 to 12hours of study. Perfect preparation with hard labour, sincere practice, whole hearted intention for seeking of not the good but the best result in 12th class examination.

Hope this helps.