What can I do if I keep failing the written test for driver’s license, by a few points since it is a TIMED test and I am a very slow reader?

Driving a vehicle on the public roads is NOT a constitutional right. It is allowed only by permission. that is why they call it a driver's LICENSE. The license is evidence that you have permission to drive on the roads. The licensing department of the state can set whatever restrictions they want, if there is a good faith reason to do so. If they discriminate because you are of a certain ethnic group, religious group, gender, or some other PROTECTED group, you can claim discrimination and sue, but if there is a valid reason, probably not. I suggest that you make an appointment to discuss this with the department that issues licenses and find out what you need to do in order to earn a license.

Since you do not have a handicap there is no basis to attack the test. You have to read the traffic booklet and your prior test questions if you have them so that you can be faster in reading the test questions the next time.

Rules are rules

You need to read faster. You do not have any legal recourse.

Study and practice! See if you can get some sample questions and work on them. Duplicate test conditions as best you can (local library perhaps) including the timing, and just go over and over it until you get better.