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I struggled with the key concepts (number properties, set overlaps, rate / work) but the TTP course is so thorough in its explanations. It gives you neat tips and tricks to master these tough concepts, for e.g. the grid method for overlapping sets or the R-T-D/R-T-W chart for rate/work problems.
I also love love love the Easy/Medium/Hard tests at the end of each chapter. This builds your Quant muscles like now other. I used to dread taking them at the beginning, but after a few chapters, you get into a rhythm – the habit of taking these test regularly also prepped me well for the actual GMAT exam.