AP Music Theory grading issues

I’m self-studying APMT this year, and figured it wouldn’t be bad because of my perfect pitch. The first 6 FRQs are pretty easy for me, but the 7th one (completing a bass line) is confusing.

I’m able to write chords and bass lines that sound good “in my head”, but the rubric used to score the music is so confusing that I’m not sure what score I would actually get on the exam (which is less than a month away).

If anyone has some tips on self-scoring my FRQs, I would greatly appreciate them. Also, here is a link to one of my Q7 responses (the one from the released 2016 exam), if anyone would be kind enough to grade / provide feedback on it. Thank you!

https://■■■■■■■■■■■■■■■■/file/d/0B9w_wUR5QEfhVVJkaEd5blFMblpuOFhQYmxUcGI3SHdrdl9Z/view?usp=sharing

Cool, thanks for all the help

Sorry no one could help! Not many kids take APMT. My son just took it last week and said parts of it were really hard. Hope you did well!