Series 7 Changing programs

I failed the Series 7 a little over a week ago. I was using STC( work paid for) and had exhausted all questions and were starting to memorize the questions and felt that was not doing me any good. So I purchased Achievable and I scored 56 on a practice exam. I take my exam again on April 8. Has anyone did this and had the same thing happen to them? OMG I thought the questions a little different but they have me calculating YTM and YTC. I did not recall seeing that on the exam last time Has any see it on the exam