Solve each and every problem from exercise and given examples of NCERT books. Use the given NCERT class 12 solutions for reference.

https://school.careers360.com/ncert/ncert-solutions-class-12-maths

Solve the previous year board papers for board exam preparaton and for competitive exam preparation refer previous year papers of the respective competitive exams. Also, students can refer to the NCERT exemplar solutions for class 12 Mathematics.