[krisoft]

> They go there with nothing and teach their children only the necessary skills to live in the forest.

To live in the forest like humans do? Because then they would absolutely teach them language, and show them how to make fire and use sticks and stones.

> How would they score on common IQ tests?

Common human IQ tests? Very badly, they would probably not do much with the paper other than maybe take it with them for fire starter, and would just wander out of the room.

On an IQ test you could conduct with great apes? Like various physical puzzles which hide treats? Very well presumably. They would have dexterous hands and great eyesight and problem solving skills, and oral traditions.