My suggestion would be instead of taking 70 questions which would take you three hours, To take 10 questions. Of course you have learned tremendous amount of valuable lessons from those 70 questions you did.
Suggest would be to do 10 questions, three easy, for medium, and three hard ones.
Instead of solving every possible combination of random critical reasoning questions, I would suggest only doing assumption on day one. And see if you can hit your target if you’re looking for a 55+ score you should probably get eight out of 10 correct. And if you’re not hitting them, you should go back to the books and study more critical reasoning assumption chapter specifically. After you have studied the assumption chapter again and made notes and made sure that you understand how assumptions work, you take another 10 questions and see if you have been able to improve to 80%. 10 questions will only take you about 20 or 30 minutes instead of three hours you can move onto the next chapter such as conclusions .