Just a side comment - to repeat what a senior college admissions officer told a student/parent presentation last week - “we don’t even look at AP scores. College Board tells us they are for placement; we don’t use them in admissions”.
With that in mind, two semesters of Chem should give you the foundation for most of what’s on the AP test. And, assuming you have a syllabus, you can use AP test prep books to identify what you aren’t covering and prepare for that portion yourself. It should be rather minimal, I would think.