@ens2006 Actually, your XC and track scores might be recorded. For track and XC there are several online portals. If you are running regional level meets scores are there, if you ran in the States or state finals they are there, if you have ever run in a local 5K, they are online too. If you ran Junior Olympics they are online too ( regional and national) Check coolrunning, athletic.net, and others. Even if your school doesn’t do an online record, others schools will so you can get your time there. Go to the specific meets. You should be able to get your PR’s in all events.
Regardings you SSAT scores, there might be a way to put in that you had the highest score in the school. It’s true there are regional/town differences in public schools. In our area in public school, 8th graders took Algebra I and it had some geometry so kids were already exposed to that. 7th grade was pre-Algebra and I don’t know how far they went but it was enough that kids regularly got decent SSAT scores.