is it like the SAT? the math I mean
Find the maths book for GED and write down the topics you need to recover. Then, watch YouTube videos about those specific topics and then read the maths book chapter by chapter while also solving the questions in the books and doing past papers you find online to test whether you understand the topics well. The same goes for Science. As a student who just messed up my Maths exams yesterday in IGCSE, I would advise you to practice maths every day to not fail terribly like me.
(I left a comment but it disappeared:))
So, basically find the maths textbook you would need for the GED curriculum and note down the topics you might have to cover. Then, go on YouTube and watch videos related to those specific topics. After that, read your maths textbook thoroughly while solving the questions included in the textbook and do past papers online to familiarise yourself with the actual question formats. The same goes for Science.
I badly needed to relearn math cuz I need to take GED kinda test. I didn't finish high school bcs of covid and financial struggle. I need help with that