I have students with all types of disabilities. I find just learning a little about each one and what they need by taking them aside from the rest of the class and out of the view of the class and discussing it helps. Sometimes they are too embarrassed to talk about what they need and would fail before asking. If I see a student struggling, I usually talk to them on a break during class with no one around or after class and ask them if there is anything that we can do together to make their learning experience a more positive and successful one. Not all students are willing to share their disabilities, so paying attention to your students and looking for signs is a huge part of teaching and being a successful teacher.