yes there are many students home clear neet without joining any coaching because after all what matters is whether you are able to solve the problems and other strong with the concepts or not if you have done good self study and have proper study material then there is no need to go for crash course you can judge yourself by appearing for mock test and by judging the performance in the mock test you can assess yourself whether you should join a coaching institute or not if you are performing well then you can do your self study at your own pace and will definitely able to make it to net on the other hand if you associate performance and find out that you are not doing well and need some guidance by joining cross course you can excel in the exam.