From Fidelity.com, some great advise on student loans.

When Philly resident Chenell Tull’s grace period ended 6 months after graduation, her $45,000 in private loans turned into $52,000. That’s because post-grace period, the student loan companies took the interest that had accrued while Tull was in school and added it to the principal.

Follow this link for the ret of the article: https://www.fidelity.com/insights/personal-finance/student-loans-for-millennials