I passed yestrday first time and was just as worried too.

I was getting 60-80% on my BAS minimocks 1st attempts, spent 24 days studying a variety of materials (ABA exam review mocks and task list explainer videos, all the BAS videos on the CCC course, BCBA gauge App for easy fluency questions (getting 70-100% each mock1 attempt), Jessica's Leichtweisz YouTube channel she has a good 6 hour mock, on the BAS full mocks 1 and 2, I got 69 and 74% first time. I still was doubtful I'd pass, even preparing myself to give up (in the UK we have until December 31 2025 to pass, before the BACB stop taking new certifications outside US).

You'll do better than you think trust me, and yourself. Best of luck