an interesting memory technique!

You're describing an interesting memory technique! What you're referring to is a combination of several proven learning strategies:

**Spaced Repetition**: When you encounter the same multiple-choice question at different intervals, your brain strengthens the neural pathways associated with that information. Each time you see it again and recall the answer, the memory becomes more durable.

**Active Recall**: The act of retrieving information from memory (rather than just re-reading) forces your brain to work harder, which creates stronger memories. When you see that MCQ again and have to think "What was the answer?", you're actively engaging your recall systems.

**Recognition vs. Recall**: Multiple-choice questions provide cues that trigger recognition. Once you've seen a question multiple times, both the question format and answer options become familiar, making it easier to identify the correct response.

**The Testing Effect**: Research shows that testing yourself repeatedly on the same material leads to better long-term retention than passive review. Each time you encounter that question again, you're essentially taking a mini-test.

This approach works because repetition changes how information is stored in your brain. Initially, memories are fragile and easily forgotten. But with each successful retrieval, they move from short-term to long-term memory storage, becoming increasingly resistant to forgetting.

The key is that the repetitions should be spaced out over time rather than crammed together. This spacing gives your brain time to partially forget, making each subsequent recall more effortful and therefore more strengthening to the memory trace.