You should direct these questions to your community college. At the end of the day, it’s up to the community college to decide whether you can enroll and to classify you as a resident or nonresident for tuition purposes.
The general consensus is that individuals in I-485 pending status can study, but there doesn’t seem to be a federal law saying that explicitly. (I-485 pending is technically not even a real immigration status. The law just says that individuals with a pending I-485 petition are not removable while that petition is pending. However, should the I-485 petition be denied, all time in I-485 pending status is considered unlawful presence.)
California appears to consider students in I-485 pending status as generally eligible for in-state residency for tuition purposes. Or at least the UCs do. See here: https://www.ucop.edu/general-counsel/_files/ed-affairs/uc-residence-policy.pdf
Additionally, students in I-485 pending status appear to be eligible for AB 540/2000/SB 68. At least according to the CSUs. See here: https://www2.calstate.edu/apply/california-residency-for-tuition-purposes/Pages/exceptions-exemptions.aspx