Don't buy too many books, buy some quality books like gateacademy's EE series etc.
Give yourself a decent start. Try solving questions in youth4work, Indiabix, Cocubes etc. Solve state level technical exams, previous year question papers of your universities and never forget to prepare notes.
Level up by GATE previous year question papers.
Study in group; help each other to help yourself.
Write technical exams, during preparation too one can write these exams.
Manage your time well, memorise formulae and numerical values.
Divide syllabus into sub-topics, allot fix time to each sub-topic, for example, 20 minutes per topic.
Experiment with questions and find new tricks to solve questions. Revise daily.
Good Luck!