You seem to be experiencing the same nerves that just about everybody sitting ATPL exams feels.
Did my ATPL's about 2 years ago with BGS and felt exactly the same way throughout the studying.
As has been said it all comes together in the brush up courses that are two of the hardest weeks (per module) you'll ever undertake.
Have faith in BGS and the equal efforts put in by the guys (and gals) that are just as passionate about passes.
If you put the work in and try to remember as much as you can and work towards getting a good overall understanding of the topics rather than relying too heavily on feedback you will be fine.
Know its hard to believe given the volumes currently sat before you, but I sat mine on a heli hybrid course that was predominately fixed wing based and got 14 first time passes. No degree, poor A level results but willing to work my bits off to achieve my dream.
Still don't know what an aileron does!
But now living my dream
Best of luck