Hi, I am assuming that you are talking about Btech studies, then some of the guidelines you can follow are:

• Create a study plan for your preparation
• Gather all the information about the official syllabus
• Study for at least six to seven hours a day.
• Add some time for breaks and other activities which can help to refresh.
• Solve the previous year question papers and compare your answers with the given solved papers.
• Practice only from those books which almost cover the entire syllabus of the exam
• You can refer to Arihant, D C Pandey Material for BTech Preparation.

These are some of the basic yet important steps to do.

Hope this helps.
Good Luck.