If you want to improve your brain's ability to create and retain memories, one way of doing this is to often recount stories. Story telling is a way of practicing having the brain recall a memory in as much detail as possible, which is similar to working out a muscle group. It's also fun!
Use a mnemonic device to help yourself remember things. Create a picture in your head in relation to what you anticipate needing to remember. You can work it into an unusual sentence or make it into a fun acronym. Mnemonic devices are much easier for the brain to remember than straight facts.
Lately, have you been having trouble with your memory? Maybe this is because you are having sleeping problems. Surprisingly, poor sleep can hurt your memory processes. If you are having trouble going to sleep at night or if you are sleep-deprived for any other reason, it could be causing your lapse in memory. If sleeping continues to be a problem consult your physician for help in alleviating this situation.
When studying, make sure you dedicate yourself to learning about that topic, and don't allow yourself too many distractions. Humans need to store information in their long-term memories if they want to recall it at a later date. To shift a piece of information long term memory, you must be sure to place all of your mental energies it without outside distractions.