Most free practice tests and app-store question banks tell you one thing: your score. A score of 68 percent says the practice run failed. It does not tell you which of the exam topics cost you the points, so the next study session guesses. The fix is to study by topic, not by test. Find the 2 or 3 topics where you miss the most questions, drill only those until the misses stop, then re-test.
This is the problem jayden is built for. A short Diagnostic maps you against every topic on the exam and shows the result as a Weak Spot Map. From there a Study Plan tells you what to drill next. Every Question comes with an Explanation that ends in a Reference: the book and section the answer comes from. You practice the open-book lookup while you practice the topic.
The Diagnostic is free, and the full prep is a one-time $49 with access until you pass. See the sample map or read what the Pass includes.