Does the provision of accommodations guarantee student success?
No. Accommodations are designed to ensure a level playing field for all students. They do not guarantee success.
Once institutions provide equal access to an educational program, it is up to the student to do the work to be successful in class. It is possible for a student with a disability to make full use of the accommodations they are eligible for and still fail a class for the same reasons student without disabilities fail classes.
Resources for promoting success in college can be found in the following DO-IT Knowledge Base articles.