I would say: Most inquisitive:
Merriam-Webster:
1 : given to examination or investigation
2 : inclined to ask questions, especially : inordinately or improperly curious about the affairs of others
Cambridge Dictionary
wanting to discover as much as you can about things, sometimes in a way that annoys people
Someone who is inquisitive asks a lot of questions and is genuinely curious about things. They might take it a little too far, but it's a very weak negative connotation and one that doesn't really apply when you're in any context related to learning.
Particularly within academia, being inquisitive would be considered a badge of honor:
It's partly because humans are naturally inquisitive and exploratory but also, and more significant, because we need the unknown, what historians of religion call "otherness," to lend our lives significance.
— David Nicholson-Lord, Nation, 6 Oct. 1997
Inquisitive really only has a negative connotation when used to describe someone inquisitive about something that isn't their business, for example, inquisitive neighbors:
an inquisitive woman who tends to everybody's business but her own
And, while it shares a root with "inquisitor", "inquisitive" doesn't share any of that word's negative connotations.
Best Answer
Another good word would be reticent: inclined to be silent or uncommunicative in speech.