What type of test would be most likely to measure an indivduals ability to solve probnlems?

An iq test seems to follow this guideline as well

The Cognitive Ability Test.

Explanation:

This kind of test aims to rank a person mental capability, for example, they capacity to learn, solve problems, ability to reason, among other things. It's commonly applied in recruitment and selection process for jobs because its results act like a predictive of job performance.