Hi Pournamipottekat,

There is no one book whicl will sail you through the examinations with good marks. It is always better to have multiple references, so that you grab more concepts and different ways of approaching to a solution is clear to you. Moreover, apart from reading, practice is very important. So, keep practicing the concepts using varied types of questions. That will help you the most. Read up other answers on Careers360 to make a strategy for your board examination, by clicking on the link below: https://www.careers360.com/question-how-to-prepare-for-both-cbse-12th-boards-and-competitive-exams-simultaneously

Thanks,