Will smoking weed worsen my problems with a learning disability?

Possibly. Smoking marijuana decreases focus and concentration, and effects short term memory. This means that it might be more difficult to understand what you are studying; and even if you do understand it, it might be harder for you to remember what you have learned.
Likely to, yes . Mj interferes with frontal lobe function, and has been shown to decrease iq by 8 points. If you have learning disabilities, this may be too much of a hurdle to overcome. I recommend you stop using weed, and start exercising your brains with problem solving activities that complement your learning strengths.