An uncle, William Ayscough, decided that Isaac should prepare for entering university and, having persuaded his mother that this was the right thing to do, Isaac was allowed to return to the Free Grammar School in Grantham in 1660 to complete his school education.
Ng isang tiyuhin, William Ayscough, nagpasya na Isaac ay dapat na maghanda para sa pagpasok sa unibersidad, at sa pagkakaroon ng hikayat ng kanyang ina na ito ay ang tamang bagay na gawin, Isaac ay pinahihintulutan upang bumalik sa Libreng Grammar School sa Grantham sa 1660 upang makumpleto ang kanyang paaralan ng edukasyon.