What is industrial standard Pre-CAB process in IT? and can a CAB be assessed by just filling up the Checklist?

Before I answer this in detail, can you provide some context about the current situation and what your end goal is.

Typically the Change Advisory Board (CAB) based on ITIL governs the Change Process.  This means that you can define it to fit your business.  Give me an understanding of your situation and I will reply back in detail.