Hey! Sorry for this question but i was totally confused which is a better way to practice among A2OJ ladders or Junior Training Sheet or random practice on CodeForces (also if it is the one how to select the problems because even for a single rating range there are more than 100's of problems and by this how do we know that we actually have learned a concept which may be missed in those questions) . You can also tell what worked out for you the best. Once again sorry for this post but i wanted to ask it and couldn't find an answer already on this. Thanks in advance.