There is very little you can do now to influence an imminent test. No point getting stressed over things you can't change. Look on the bright side: at least they are being tested and if the result isn't great then at least something can be done. With MS, probably the most difficult thing is not being able to control the things you once imagined were controllable. The corollary to that is learning not to stress about them, or I daresay things will feel worse than they are.

Do not stress about stuff, you'll be reet.