If you are in the program and do not recieve the diploma, that is a bad thing. Entering that course, you are expected to try as hard as possible and do everything to get the grades. If I were you, I’d talk wtih my teachers and guidance councilers about working together to get my grades up and maybe get some extra help. When colleges see you enroll in a program like that, they expect you to succede. It may not be the end of the world, but it will certainly not look good. This is coming from somone who took all Higher Level IB with 4 APs, too. It was an insane amount of work, and I struggled at first. After making plans with my teachers, everything worked out fine. Communication is key.