what is the word to be used when describing your subordinate achievements

what is the apt word that is to be used to describe the enthusiasm to learn and involve in work.

Completed the assigned work well within the time and also proactive in learning the subject.

Does the above statements make any sense, I would like to recommend his promotion also please give suggestions

Solution 1:

I would recommend

a quick study:

"one that can speedily learn the essentials of something to be done

especially : a performer (as an actor, musician) with a gift for learning with remarkable speed new material (as lines, stage business, scores)"

(Merriam-Webster's Dictionary