what is the best reference book for 12th boards? please note, i need to know the answers of all the questions correctly to get full marks in the exams.

chemistry doesnot need any reference.

read ncert as many times as u can. solve all the questions. be thorough with it.

be thorough with the lessons.

solve 5 years question papers n u are sure 2 achieve the goal

plzzzz approve my answer.