We first need to identify some solid guidebooks. For math, this includes the Manhattan series. For verbal, go with the Manhattan SC guide and the Powerscore CR Bible. Another essential item includes the OG series for question practice.
Something still seems off here, however. I suspect that a major obstacle is lack of time or consistency in your preparation. Simply put, that needs to change immediately. Try to commit to a few hours each day and go overtime on the weekends.
Most of your efforts, at least for now, need to focus on math. Along with the
Manhattan books, practice with the OG questions for each topic. The guidebooks list OG questions that correspond to each chapter, so do those to let the concepts sink in. And don't worry if you already completed the OG; just do it again. I would also advise you to skip the end-of-chapter questions in the
Manhattan books. Those review questions will only frustrate you and consume too much time.
For verbal, just read the guidebooks mentioned above for now. Both books contain decent practice questions already, so just do those. You can attempt the OG later.
And keep a (simple)
error log. Just note which questions you answer incorrectly, the question type, and the reason why (time, math error, confused, etc.). Revisit those questions later in the day and again the next day.