NSB Science Background study

Hey

I come from a NSB (Comp sci/ Econ) so I have the reasoning skills and my interpretation of data is my biggest strong suit. I have sifted through this subreddit but it seems to just be a big pile of contradictions which I understand since it is everyone's personal experiences. My biggest weakness is section 3 as I have zero science knowledge. I have read the outlines of topics needed to study for S3 (although I know some people are gonna say "its all just reasoning" i know I promise but I got no knowledge to start my reasoning), I have looked at the comprehensive lists by:

https://www.reddit.com/r/GAMSAT/comments/6hrv27/a_chemists_guide_to_chemistry_section_of_the/

https://www.reddit.com/r/GAMSAT/comments/q1p1ed/free_gamsat_section_3_study_resources_that_in_my/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

And then using khan academy + youtube (Des O'neil guy.....) to understand

I have also been reading that March was horrible especially for S3 and basically just a speed comprehension test, I only have two sittings (Sep + March 27) to get (idk 75) which I know is hard but what else.

I was just wondering if there is anything more well guided (outside of those like 1000 dollar courses - the gamsat is expensive as it is), I just have a massive feeling of uncertainty surrounding the exam itself and I have consumed so much about it but I just get more confused. Is this the point of the exam, basically stress us out to the max or make us give up.

So yeah, I was used wondering what peoples opinions are with it, do I just speed run content for the next month to gain an understanding of idk *science* (I can do maths) and then just start spamming questions + reasoning + essays or would I be speed running content for like 2 weeks then going hard. I am just hesitating starting because in the end of the day the exam is $700.

I have also found this reddit post
https://www.reddit.com/r/GAMSAT/comments/13q418o/a_cookie_cutter_guidestudy_plan_for_first_time/

It says to not spend alot of time on background knowledge but I have none, also just spam acer tests and pray. Idk it all just seems a bit vague and bad for a massive exam - and this is coming from a comp sci student where we are literally the most vague specs known to man and its just hoped and prayers you are doing it correctly. Also, I learn best from reading, would just my first year university science textbooks (just loaning from uq) would work best cause I know gold standard has been ripped to shreds and I don't feel like dropping an extra 500 on hopes and dreams.

Thank you in advance (as a stressed + confused girly)