Hi,

To prepare for MET or any exam for that matter your primary approach should be to be familiar with the exam pattern and syllabus. The next thing you should focus on is to rather than randomly studying you must focus on topic wise weightage so that you will be able to focus more on topics that have higher weightage. Next, you should have a proper time table and focus on time management as at this point of time you may be having other entrance exams and your boards too if you are currently in 12Th. Focus primarily on NCERT books and then refer other study material. Practice and revision is the most important part. Solve previous year papers, sample papers and mock test as much as possible.

You may refer to this link for more tips , additional study material  and topic wise weightage: https://engineering.careers360.com/articles/how-to-crack-met

I hope this helped you.