Is it possible to clear IBPS RRB PO in 4 months from Scratch?

Myself 23 M. I have done b.com from a local college in Gujrat. I am a complete beginner, never appeared/prepared for any competative exams.

I need some honest advice from people who have actually prepared for RRB PO/Clerk.

I’m planning to start my preparation now, I have around 4 months in hand.

So my questions are:

1. Is it realistically possible to clear IBPS RRB PO in 4 months from zero level?

2. What should be my strategy if I want to maximize my chances?

3. How many hours per day I have to study?

I would really appreciate honest guidance from those who’ve been through this.