The correct answer to this open question is the following.
Unfortunately, you do not include the terms of the unit you studied, to tag important terms you study in class. Only you know that.
What we can do to help you is to comment on the following terms so you can adapt this information to your needs.
My forgetting experience was that I could not remember where I left a note with an important phone number that my dad needed. It was a number to call a client to follow up with a possible purchase. So it was very important for my dad.
The memory terminology that I can use is that the Hermann Ebbinghaus forgetting curve. This psychologist studied the relationship between forgetting and time. He came up with a curve revealing the relationship between these two factors.
So what I did was to try to remember the time of the day when I took that note and the place where I was. I now know that the more time passes by, the more difficult it is to remember.
So I did follow the sequence of my activities from that last clear memory to the present time, and that is how I could come up with the solution and remember the place where I kept the note.
There are some other theories that help to explain why you forget. We are talking about the Decay Theory of Forgetting, the Retrieval Failure Theory, or the Interference Theory.
