Read and Quiz your short term memory
There are many exercises for short term memory but what I find to serve two purposes with one activity is reading. By reading a short story, a chapter in a novel, a poem, or an article, you are educating yourself and expanding your horizons. In that same time, you could be giving yourself a short term memory test. When you are finished reading, ask yourself detailed questions about what you read. You will have to recall the information and you will also becoming more comprehensive about the literature. Don’t try to remember everything you read verbatim, but the more you remember and comprehend the better off your short term memory will be.