How many times can I take the Pre-assessment?
You can take the Pre-assessment as many times as you want. There is only one version of the Pre-assessment, so you will not see new questions on subsequent attempts. Thus the benefit of re-taking the Pre-assessment is limited after you “pass” it once.
However, if there has been a lapse in time between your attempts on the OA, or if you have had a break in your studies on the course, re-taking the Pre-assessment might be beneficial. And I do recommend also taking the practice assessment at the very end of the MindEdge course (behind section 8).