I am sorry if I am vague but since its been 2 years since I last read that manga. I just couldn't find the title.

A normal high school boy pressurized by his mother to be studious and also appoints a maths tutor for that purpose. But little did she know that the math tutor is a sexy lady therefore the boy finds it hard to concentrate on his studies.

Adding to it is a classmate a girl(studious with glasses) actually with big boobs who sees this boy studying day in and day out even at the school library and has a sudden crush on the boy seeing his determination

Katekin maybe this?

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Yeah that's the one. Thank you very much