hi,

see there is no short cut to get a good score, right now due to corona pandemic cbsc has postponed again the 12th exam, but when the exam will held on due time all the exams criteria and pass fail rules will be maintained, so you should utilize the time and focus on your studies. if some one fail to get the pass marks allotted by the concerned board then the candidates will not awarded with pass title. so just practice and regular give revision to the lessons.

hope you may understand.