IAmNeil

+1 on the good GF
All of the above is good advice but you know him best and you know best how to act around him. Both my partner and me have done the CFA and we are both different. She sounds like mad’moiselle (above) and is prone to anger when stressed. I just go into myself and like to be left alone.
When I was studying all I wanted was to be left to make my own decisions and what I was going to do. External pressure to do things or not to do things that are not CFA related, just heaps unnecessary pressure on. Also, saying anything about whether he will pass or not is redundant. Unless you have done the course you have no idea. The best encouragement you can give is to be positive about all the scenarios that are possible. Tell him that if he fails, you’ll support him in trying again. Try to make him aware that you know what a big deal this exam is to him. He has invested a huge amount of his life into attempting it. No matter how smart you are this exam is a toughie.
Good luck over the next couple of weeks.