I can't stress enough how important it is to do studies, and practice your fundamentals. Also I want to make a point that no matter what excuse you may have about doing them, just do them. Find time, even if you only have an hour! I did all these in an hour, and forced myself to only spend 1-2minutes on these. I learned a lot and found things I still have questions on. I know now what to go practice some more. Practice practice practice. Don't expect your studies to be amazing, if it's easy then you are studying wrong.