Hello candidate!
12th Board Exams are the most important part of your career. The 12th Board percentage will become the criteria of various scholarships in your further studies. The board exam score will form part of your C.V. in the future, also it makes you eligible for several Govt. jobs. Hence, you need to give your 100% in your 12th board exams and attain a dream score that might be 90% or even 99%.
And when we are talking to the commerce students, things will automatically get interesting. The Arts students need to learn a lot of theoretical topics and have to be very creative while giving the performance in their practicals and on the other hand Science students have to remember infinite formulas, concepts and practice countless numerical questions. However, the commerce stream is far different from the Arts and Science. Here students have to face a lot of challenges related to no. of calculations, vast syllabus, and studying business-related terms.
So I recommend you to make a proper schedule do smart work rather than doing hard work and the most important thing just focus
focus is the main thing that you need to maintain when you are going for your preparations of your exams focus and consistency read well prepared well and study with all your mind then only you can prepare well.

All the very best hope it will guide you.
Regards!