My suggestion is that you should know the key and method to work on these problems before you actually work on them. For example, before I did many of the RC, I had learned through some experience what I should focus on and what to remember. Lyricling in his JJ said that he paid specific attention to one particular type of sentence in the paragraph. So know what you need to take from each program is important.
Same to the SC and CR. Find some typical problems and figure out what these problems are about. Then re-apply the same rules to other problems when you study. So it is a process like this: do some problems --> learn new points --> reapply to others --> learn more points --> ...
Your objective is not to finish all the tests you have, but learn as much from them.