Confusion over the Verb tense in a sentence
Can anyone tell me if the following tense of the sentence is correct?
If i use a past tense "studied" first, can i still use the present perfect tense "has learnt" later or others? Thanks for your help
But, during the time he studied independently at Athenian, he has gradually learnt to take into account all subjects, and as a result his performance improved evenly among all courses.
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