Sometimes I find myself doing well, and I see that I’m progressing. Then I read a book, or accumulated some new piece of information, and to my puzzlement, instead of advancing and doing well, I noticed that I’m declining and not doing well. I forgot where I read this from, but it’s normal. A lot of us go through this. The mind needs time to absorb and adjust to the new information that is coming in. Give it time. Once this period is over you will do much better with the new information you have gathered. It’s funny how the mind works.
That’s why there are studies that say your mind do better when you’re not thinking or trying hard. Or that you’re more creative and interesting ideas come to mind when you’re relaxing or go about your business not thinking much. So when new information comes in, you’re processing it.