Hello! So I am currently using UWorld and Kaplan, I find UWorld super helpful in the rationals and I do them most often. I found out that by taking my time and reading every rationals, my scores on the Kaplan prep have increased. When I read the rationals I will write down the concept in my own words and in a shorter paragraph because you will most likely not get the same exact question again but knowing the concept is what is key. I would recommend doing ~100 questions a day, and I honestly end up doing around 200 and I take my test in two weeks. I recently just took the computer adaptive test on Kaplan and got the green light which was comforting. When I started studying for the NCLEX with these two preps I felt honestly unprepared, but with consistency in doing questions and trying to understand the broader/general topic I feel more comfortable now. I would not reschedule your test! I think you've got it, you just haven't found your study groove yet.