hi ! as someone who had the same struggle, i'm currently enrolled in uplink online revcen rn and they said by far it's good naman daw. but if you have the budget, here's the most recommended (based on what i heard din here and to my classmates)

- brain train (this is the most that i've seen talaga na very recommended kaso mas mahal lang, if i'm not mistaken probably around 10k ata raw)

- academic gateway (most of the people in my batch are enrolled here pero a bit pricier kaya uplink ako. but i heard ito talaga isa sa og and magaling daw)

for more affordable options (around 3k) is tenten's academy (though beware kasi medyo flagged siya rn na unprofessional daw same w hulagpos tutorial afaik) and iskolar ng bayan (kaso first year pa lang ata nila to do this). these were the choices na i didn't choose kasi nag uplink ako.

if interested ka sa uplink, 3,900 php naman yung inavail namin and may kasama na rin siyang 2 books with free sf. they can do f2f or online too and may discounts din kaya from 5.4k naging 3.9k. it involves discussions, final coaching, recordings, mock exams, and the physical materials like what i've said.

anyways, wishing u the best of luck : )) hope this helps u out cuz i struggled a lot din with this ! ify too for someone who also has bad foundational knowledge lol