Not today thank you

I have a trial examination today and I'm not ready. I have done the whole course, I've seen it, read it and tried to memorize it. But I tend to forget very easy stuff and words. I'll probably botch up and confuse everything.
I so want to go down to the gym and flex my aching muscles and joints.
But I can't until after.
Ah well, as Hercule Poirot would say: 'I will do this by using the little grey cells'.
Unfortunatly I have killed most of them off by consuming alcohol over the course of several decades. The spud-faced nippers in my class are still one step ahead of me. But I suspect they will catch up by way of binge drinking in no time.
First puberty. But then: Ah! Maturity!
And then: Oh no! Dementia!
Alas impaired reasoning is bothering me at the moment.
I just hope I do not forget to turn off the gas when I leave for uni...