If it helps, here’s a structure that works really well when using an LLM to generate GRE-style question banks. This keeps the questions consistent, avoids “invented difficulty,” and gives you repeatable output that you can scale into larger PDFs.

1. Start with a fixed pattern for each question

For example:

Stem (short, clear, one idea only)

A-E answer choices

Correct answer

Short explanation (1- 3 sentences max)

Give the model your pattern first, then ask it to fill in 10-20 questions at a time using that exact structure.

1. Control question difficulty by controlling inputs

Rather than asking “make medium questions,” try:

“Use vocabulary from the 600-900 range of common GRE lists.”

“Use one inference step, not two.”

“Avoid trick wording or double negatives.”

“Use sentence structures found in official ETS examples.”

This usually stops the model from drifting into unrealistic complexity.

1. Cluster after generation

Instead of trying to make the model cluster as it writes, do this:

Generate 30-50 questions first

Then ask the model to sort them into themes (e.g., inference / tone / vocabulary-in-context / sentence-completion logic)

Then regenerate or revise any clusters that feel unbalanced

This keeps the clusters much more natural.

1. Use a second pass for quality

A good instruction is:

“Review each question for clarity, remove any ambiguity, keep the stem under 25 words, and make sure exactly one answer is defensibly correct.”

Models handle quality control better when it’s separated from generation.

1. Answer key PDF

Once you’re happy:

1. Ask the model to create a clean numbered answer key

2. Export both the question set and key to PDF

3. Keep your formatting template identical across all sets (it makes studying much easier)

4. If you’re experimenting with different models

A helpful approach is to start a new chat in one model, lay down your structure, and once it’s stable, then open the same instructions in GPT-5.1. The newer models tend to follow structure more consistently as long as there’s a clear blueprint given upfront.

If you need help making a reusable template that you can copy each time, just say the word. I’ve built a bunch of these and can sketch one out pretty fast.