Suffering from sieve brain

I spent hours on Monday going over and over all my formulas for areas and diameters and perimeters and was doing quite well.  However, today I cannot remember which formula goes with what.  I think my brain has holes in it.  Kathryn will not believe that I have lost any semblance of the knowledge that she had shoved into my head on Monday afternoon.  Oh goody me I have to go in to the class tomorrow and try to follow what Martin is saying.  I think he is a wonderful teacher but I just cannot keep up with even the slowest students.  I am banking on remembering the formulas when we do our exams.  I do not promise to get the sums right but I absolutely will get the formulas in.  If I didn't need this subject to finish my SACE I would run kicking and screaming far far away from anything with numbers.  Aaaaaaaaaaaaaaarrrrrrrrrrrrrrrrrrrrrrrrrggggggggggggggggggggghhhhhhhhhhhhhhhhhhhhhhh!