How do I get a decent CGPA in the bit mesra exam system?

I know someone who started with 5 pointers and 3 backs but managed to secure a good placement after his course. Here are some things, which my friend followed to do so. 

• Have a sense of the subject and go thoroughly over the syllabus and attempt to form a conceptual picture of what you will study in the semester. It may at first seem hard, but it will require some time and interest. Learn about these subjects with actual life implementations. 
• Know where to begin with. Be mindful of the important texts, notes on which you have to study, etc. The best way to do this is to ask the seniors. If you get it right, then you can save time.
• Try and get the previous year’s question papers. It may be not always helpful, but the majority of questions are selected from the last two or three years.
• If you can’t memorize 5-6 modules per subject, particularly for 3-4 papers in a row. Try to prepare for fewer modules really well.
• If you have a tendency to go deep into a single topic and have difficulty following tutorials you can solve tutorial sheets. Also, try to make notes on your own, it will help you understand the topics better. If possible try to teach someone else, this helps a lot. 

Try to cut out the things that waste your time like Facebook, Gaming, TV series, etc.