I revise since I had been to school.
I revise since I arrived at school.
I revise since I arrived at school today.
No. In broad terms, Simple Present is used to describe recent routines and habits. eg I revise every day.
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No.
In broad terms, Simple Present is used to describe recent routines and habits.
eg I revise every day.
You seem to be just guessing about the meaning of these various tenses. Please review them in your grammar book, and then post again. Then I'll be happy to comment further.
Clive