DGD studied Mathematics at Hertford College, Oxford. Prior to starting his degree, he achieved 4 A*s in Mathematics, Further Mathematics, Physics, and Computer Science. 

He achieved the highest mark in the Oxford’s admissions test, the MAT. In terms of tutoring, he is good at helping Oxford applicants with PS review and mock interviews. 

He also can teach A-Level math and further math. He received Gold for every level of the UKMT challenge and finally progressed into the Olympiad round, he also received Gold in the Physics Olympiad.