If time management is your issue, that means you are slow. You've noticed that your accuracy is not great either. So I'd say focus on accuracy first. Practice official questions, un-timed, and make sure you understand each question and find an efficient solution no matter how long it takes. If you find a solution that takes 5 minutes, you have not found an efficient solution yet. Practice with patience and your speed will improve with time. Have you checked out the guide to Q51 on GMAT Club?
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