Comparative memory
Classify similar events and dates and write them on paper. For example, is the September 18th Incident of1931September 18 easier to remember together with the July 7th Incident of 1937 and the August 13th Incident? For another example, comparing the Enlightenment in the West with the New Culture Movement in China, the memory will be more profound!
Write it down yourself.
A good memory is better than a bad writing. When you look for a question through books, you might as well write it down. Write silently according to the book first, and then arrange it into paper materials after it is correct. Every time you review, pick a few questions to strengthen your memory. It's hard to forget to look through your own finishing content every few days! Moreover, how can you not cherish the fruits of your labor? Save every note, it will be of great use in the future!