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Start off with GMATPrep test if you haven't taken one. Its a more clear indicator of what you will be scoring in your actual test. Remember that other prep test mocks can be used only upto a certain extent - to know your strengths/weakness and testing experience, but for more accuracy GMATPrep is the best.

For CR, you can check out powerscore CR bible. Don't fret too much with strategies/finding patterns, use it to understand what types of questions are there and how to approach each one. I found 'thursdays with ron' more informative. If you are having hard time comprehending the argument, try taking notes - write down the conclusion and premises. You will comprehend better. Initially it will be a boring task, take your own time to solve and once you start seeing improvement you will be interested to solve more problems. Then you will learn to cut short notes based on your needs. Your speed will also improve.

For DS - practice a lot. DS questions are mostly to find a value or yes/no type. Be clear with what is being asked, if its find a value then we should get only one particular value there cannot be more than one, if its yes/no - it should be either one and not both. Try rephrasing the question first. It is more important to know what is asked and what is needed to solve. Go through the statements one by one and try to solve. Follow the A D, B C E order. While solving problems make flash cards for shortcuts like if x^2 < x then 0 < x < 1. For percentage increase/decrease you need both the original and the increased value. Is x < y - we need to know the signs of both variables. For absolute value problems you have to split up the eqns. So the statements should have something related to this. You will learn a lot of these shortcuts when you review a lot. So try to follow the AD BCE approach and review a lot to learn more shortcuts.

Take more mocks if you have timing issues/keeping up the stamina till the end of the test, else take once a week or two weeks once making considerable improvements in necessary individual sections. Hope this helps

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Thank you so much Sam for your valuable details & insight towards the Prep strategy.
All The Best ....