This message is addressed to teachers and moderators, I am neither but I think I can answer the question. In the two sentence examples you gave, you seem to have the phrases, have focused, and have completed , the wrong way round. The first sentence:- "I just recently graduated from the RMIT University’s Masters of Professional Accounting degree, where I had focused my studies on accounting and taxation" .
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I actually would like to ask about why we use "I have" in those circumstances, why not "I had"