an apt pupil/student
From Longman Dictionary of Contemporary Englishan apt pupil/studentan apt pupil/studentformalINTELLIGENT a student who is quick to learn and understand SYN able → aptExamples from the Corpusan apt pupil/student• But once at university I was an apt student.• With every move she gave a little gasp, as her body, previous experience or not, proved an apt pupil.