I took Algebra II over this last summer as a 9th grader. I would highly recommend, and if you’re willing to spend 4+ hours a day working at your own pace, you could even try doubling up on PreCalc and Algebra.
For some context, I found out the textbook my school uses and self-paced my progress. By the end, after having worked for around 60 days with 3.5+ hours of study time, I was able to consistently score 99 or 100 on NY Regents Algebra II exams.