The FAR portion of the CPA exam utilizes psychometric scoring. This is a graded system where questions are weighted differently. As you pass through the multiple-choice question and task-based simulation testlets, they will progress in difficulty according to how well you do.
Harder questions are preferable, because they are worth far more than easier questions. It won’t be possible to gauge how well you are doing, because questions are not scored on a 1:1 basis. Your only assurance is to prepare as well as possible so that you can pass the test.