Is there something between auditing and taking for credit?
This depends on your institution, so you will have to ask someone there, a general answer is not possible.

My undergrad institution allowed for taking some courses (specifically, those not part of the specific requirements towards your degree) as pass/fail rather than graded, which meant if you scored at least a C you got credit and if you scored worse than a C you didn't, and the course wasn't included in your GPA.

However, auditing a course typically gives you the same access to course materials as taking it for credit; the opportunity to learn should be the same however course credit is assigned. Auditing is not typically a way to prepare for a course, but rather for self-enrichment and perhaps to learn material outside your area of expertise without being evaluated to test your interests.



edit: The OP has since indicated that their reason for auditing these classes was that they hoped to prepare ahead of taking the course for a grade, due to disability they experience. I would recommend consulting with the institution's disability office to get proper accommodations rather than using the audit or pass/fail system directly.