Yes, you can pass your exam without coaching classes as well. You  should be determined and self motivated to crack your exam.

You can follow below strategies to crack your exam

This is not that difficult or I would say it depends on student as if he/she is clear with all the basic concepts then only self study would be enough for him/her but if the concepts are not yet clear and you feel that you need a mentor/guide for your preparation then better to go for coaching.

Hope this helps!!!