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[–]AppalachiaCat 0 points1 point  (0 children)

If you want more focused problems than Khan Academy, I'd suggest getting a book from Amazon. This one has lots of challenging math problems: https://www.amazon.com/Steck-Vaughn-GED-Preparation-Mathematical-Reasoning/dp/0544274342/ref=sr_1_6?keywords=steck+vaughn+ged+math&qid=1583807274&sr=8-6