The process I ended up following is as below.
1. I requested transcripts online to be posted to my home address. They were delivered in about 10 days.
2. I went back to JNTU, headed straight to the examination branch, went to counter number 3 and got my CN23 form stamped. I pasted this form at the back of my envelop and sealed it. The envelop before I gave it to post office looked like this.
3. I went to the post office inside JNTU and posted it to WES. Once you post it you will get a tracking slip that looks like this.
My documents are still on the way, so I cannot comment on whether they will be accepted or not.
The contents in the envelop are all my transcripts, CMM and provisional degree (all of which you can request online). I didn't add any college attestations or ARR forms.