The quiet kid in the back has probably noticed more about the class than anyone talking.

Talking uses the attention that noticing requires. Somebody who spends the hour listening has the room mapped: who is struggling, who is bluffing, what the teacher actually wants, which is why quiet people are so often the most accurate about a group. Silence is not absence. It is frequently just a different use of the same bandwidth.

If you are the quiet one, your read is worth saying out loud now and then, so pick a moment rather than waiting to feel confident. If you are the talkative one, ask the quiet person what they think before the conversation closes, then wait for the answer.