It is OK to reveal your score if you want to or discuss the top 3 weakest areas from your score record.

You shouldn't discuss anything to do with the format of the exam, the types of the questions asked, the actual questions or answers etc.

Try installing SQL on your own PC/Laptop and playing with the things you aren't sure of. You can buy the developers version cheaply or install a 180 day trial.

Try the course below on the MVA if you haven't already

https://mva.microsoft.com/training-courses/querying-with-transact-sql