Mathematics is all about understanding concepts, practicing them on regular basis and relating them with real life incidences. As you practice various questions from your textbook or from any other resources, you come across questions with varied challenges. Your best friends are those problems which you are not able to solve easily. If you solve a problem on your own in the first attempt, it’s good. It adds to your confidence and validates that whatever you know works in solving such problems. In the beginning you may need this. If you can solve all the problems without much difficulty, then you are just validating your knowledge. These problems are not helping you to expand your understanding of the concepts. You must look for other sources of questions because your brain is not getting challenged enough. A conceptual and non-tricky problem, which doesn’t get solved by you easily, helps you in many ways. As you try solving such problems in different ways, you deve...