It can't be said enough - do NOT stress over your boson scores.
I've seen plenty of posts saying this exact thing, but they helped me relax before the official exam and approach it with confidence, so I'm posting ANOTHER ONE of those to lift someone's spirit up. Boson exams are an entirely different experience, I'd compare it to training volleyball setups with a heavy basketball. Once you switch to the light one (official exam), it feels like a breeze.
I failed every boson practice exam. My total scores were as follows (A to E): 78, 76, 73, 81, 77. Close, but never close enough. I just passed my CCNA today with following scores:
Automation and Programmability: 90%
Network Access: 100%
IP Connectivity: 96%
IP Services: 100%
Security Fundamentals: 80%
Network Fundamentals: 95%
I've seen people with similar results after they got 5x 60% on bosons. Don't worry about your scores. Do the exams. Read the explanations. You'll be fine.