Assalam o Alaikum

I have received my call letter for Psychological assessment today. There are a couple of things therein which are confusing me a wee bit. I would highly appreciate if any one can help me out in this regard.

1. What do they mean by "admission certificate" which is needed to be brought both on the days of Psych assessment as well as Viva?

2. Also, what receipt are they talking about which is to be acknowledged?

Waiting for reply from a good soul.