Should I take the 1 or 2 month plan if I want to give my exam by 18 december max.

Hi everyone, I'm targeting r2 for my master's applications and I want to give gre( switching from GMAT cuz quants is my weakest point). I scored 288 on the kaplan mock (142 Q, 146 V)( that's without any quants prep). Should I take the 1 month plan? What all should I do to maximize my chances of getting the highest score possible? People who have been in my position, can you pls tell me about your journey and how you excelled in the exam, it would mean a ton to me! Any extra suggestions/advice/resources etc any and everything is welcomed!!

Thank you sm guys in advance! 💗💗