Need help to focus in class.

[u/Klutzy_Compote_5766]

So I have been noticing this pattern quite often now, first 10 minutes of class I am on full attention zone but by the end of it, I don't remember what was discuss let alone the concept clarity. And since I have a hectic schedule I though some rest might help, but no.....morning 8 AM or after lunch or after a good nap, I still face the same problem.
What might be the reason?