GRE beginner

Hello Everyone! I just recently joined Gregmat+ to start my gre prep. and watched getting started videos( for one month plan). I am from STEM background but i am very rusty with my quant concepts and definitely need verbal foundation work too. I wanted to know if i should just follow the 2 month plan on Gregmat or do the foundation stuff first ( for quant like math review guide first) i have 3 months to prepare then i will appear for the test. The site is a bit overwhelming so i am asking here just for proper guidance.