I have what probably qualifies as the relatively-recently-named "severely deficient autobiographical memory".
Notes, notes, notes. Then review them before an interview. Not bullet-point notes of things that happened (that's fine too, but not just that) but make stories when they're very fresh, like, right after they happen. You won't be able to turn raw bullet points into a story later, you'll forget too much.
Then take some time to match stories to common interview questions. That's your prep document. Feel absolutely free to fill in gaps where needed, most folks' "real" memories of these things are half wrong anyway, and there may be times you literally couldn't have an acceptable answer to a common question without making some of it up, because you didn't take useful-enough notes. What are you going to do, fail every interview that asks that question forever? No, just make the story you need, connect it to reality as much as possible, and move on. But do it ahead of time. And you only need to do this once per such question. Perhaps you'll even manage to take notes on a less-invented story later (I've found that nearly all of these stories need a little invention, though, even if you have perfect notes, to fit into the acceptable range of responses)
Notes, notes, notes. Then review them before an interview. Not bullet-point notes of things that happened (that's fine too, but not just that) but make stories when they're very fresh, like, right after they happen. You won't be able to turn raw bullet points into a story later, you'll forget too much.
Then take some time to match stories to common interview questions. That's your prep document. Feel absolutely free to fill in gaps where needed, most folks' "real" memories of these things are half wrong anyway, and there may be times you literally couldn't have an acceptable answer to a common question without making some of it up, because you didn't take useful-enough notes. What are you going to do, fail every interview that asks that question forever? No, just make the story you need, connect it to reality as much as possible, and move on. But do it ahead of time. And you only need to do this once per such question. Perhaps you'll even manage to take notes on a less-invented story later (I've found that nearly all of these stories need a little invention, though, even if you have perfect notes, to fit into the acceptable range of responses)