Very good to practice

This site is very good for practice. really an excellent one. however, I have noticed on one scenario that the score generated is not accurate, may be my expectation wrong, but I have sent in the query to support team. I feel it could be some programming error if so, they can address this minor issue and look into it that would be greatly appreciated.
This has helped me in passing the final exam for SAS Base Programming and I have scored 89%. So really good help.