To crack any exam totally depends on your self motivation and determination. 

There are many students who have cracked their exam with self study without coaching classes.

Coaching classes can only guide you to score good mraks in your exam totally depends on you. 

You can plan your study. 

Make your proper time-table according to your comfort. So, that you can easily complete your syllabus on time and you get proper time for revision. 

Set your daily and weekly targets. 

To score good marks make sure your concepts are clear. Work on your observation skills and drawing to prepare for the Aptitude and Drawing tests, Utilize your Engineering Drawing notes for 2D/3D questions’ preparation.

You can make your important notes which will help you at the time of revision

Refer previous year papers as well for your practice.

You can also solve complete mock test series to analyse your preparation level at regualr interval of time.

Good Luck!!