You may want to go through lessons on each of these topics you are referring to -- sequences, rates, mixtures, work problems, algebra -- and go through all the various permutations of each topic. We cover all these permutations in our PS PILL course. For example, with rates questions -- we'll show you a problem in which two cars are going in the same direction. Then we will change the question slightly so the cars are moving in opposite directions -- and then again with the cars going 90 degrees
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