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A great supplement for your hard work.
Honestly, It's all in here. But you must do your homework on the side to learn the basics. The videos guide you to recognise patterns, watch them over and over again until it's ingrained in you. The best part is the solved video questions. Gives you confidence in knowing that you can actually see the sums being solved rather than just seeing answers on a post/board. Go ahead and buy it, but please know that it is not a substitute for hard work, it is a supplement to your effort, a great one.