Oh god no. I'm in my mid-40's and have just picked stuff up over the years without any formal training, but I have absolutely nothing I can offer to help you at this point aside from thoughts and prayers.
If you have been cornered enough to be asking and learning about Amplifiers and Circuits on a manga hosting site 2 days before your midterms, you must be really cooked, buddy.
I'd rather recommend you to check out ChatGPT or some AI for precise information and well tailored response. (Though check out for the reliability of the information as GPT sometimes give your very dubious response with no cited reference.)
Good luck to you and hope you manage to figure it out.