Try Mind mapping as part of your activation. It will help to build a better long term memory.

I really recommend all beginners take the time to mind map more of their first few books. It trains the mind to actively look for information and link it in a memorable way.

There is nothing wrong with your memory. After learning anything if you haven't made notes you will forget 60% within 24 hours. 80% within 48 hours. Unless you do a review.

If you want to keep a good memory of what you have learned and reduce pre exam cramming and revision. Review your notes daily the first week after creating them. Then review once a week for 4 weeks and then once a month for 6 months.

That way you will have a 70 to 80% recall.

Alex