Well, most of us know the what and when of “Exam”, but when it comes to “How” there is a huge gap. Any exam requires preparation unless it is a surprise test!. How much time and energy varies from individual to individual. But overall, you need to spread your focus on the following aspects.
1.Study the Right Info in the Right manner.
This means, maths has to be practised and not read. English has to be improved by communicating more and writing more.