Subscription is not an option - but a necessity

I paid for this service after having failed my first SAS exam, reaching only 54%. I wanted to pass "honestly" at first, but at the exam I realized I was being queried on subjects not covered by the course literature. A few weeks in I realized subscribing to practice exams wasn't only optional but practically "required" in order to achieve a passing grade. There are so many details (mostly irrelevant in a professoinal setting) which just have to be memorized. 
I passed my second exam with a 84% score, I would not have been able to (barring months of rote memorization) had it not been for