You can use a cranial nerve mnemonic to remember the pairs of nerves, but you can also use it to remember other things. Mnemonics are words that you put together that stand for something else. In cranial nerves it could be "Ottafvgvsh" (even though that is not really a word) oculomotor nerve, the optic nerve, the olfactory blade, the trochlear nerve, the trigeminal nerve, the abducens nerve, the facial nerve, the vestibuloclear nerve, the glossopharyngeal nerve, the vagus nerve, the spinal accessory nerve, and the hypoglossal nerve. Some might remember it better using three "o's". It's all in how you memorize it. If it makes sense to you that is all that matters.
Cranial nerves mnemonic is how you are going to want to train your brain to remember. If you use this method often you will find that you can often associate other things with the information that you need to remember. The more you do it, the better you will become, but it is good strategy for recall large amounts of information; especially for tests or exams.
This is not the only way to recall information, but it does work. There are other methods that you can use to retrain your brain to work more efficiently. Some of them are by using lists and mnemonics to help you remember, and others will show you a completely different way of storing information. I'm sure we have seen the kids learning math a different way and actually doing much better with it. Your brain in the same; you can retrain it and make it more effective.