What is the "budget" concept for GRE improvement? (efficiency + skipping → time → accuracy)

Efficient pacing and strategic skipping create a budget of extra time. You spend that budget where it gets you the most accuracy at the best rate, just like shopping for the best deals first.

Your first pass through the section is about grabbing bargains: questions you can answer quickly and accurately. That efficiency creates a time surplus. Your second pass spends that surplus on harder questions, but only the ones that still look like reasonable deals. A question you're 80% likely to get right in two minutes is a better buy than one you're 40% likely to get right in four minutes. Every minute you save on an easy question is a minute you can invest where the return is still worth it.