Cpt

I am going to appear for CPT in June. I have always preferred self study. Initially I joined a coaching for CPT but it didn't work out, I found it mere wastage of time and efforts, so I left the Coaching. Now as I meet people or my friends appearing for CPT. everyone has one question to ask 'kaise kar kahi ho yr'? and everyone has one sugession to give ' CPT hai mazak nhi coaching bahut zaruri hai...kahi join karlo warna nhi kar paogi'. After hearing the same thing again and again from soo many people it really raises a question in my mind..... 'Is it really necessary to join a coaching?'