The teenage maths genius, from Wokingham in south east England, reportedly scored 162 in his entry IQ test, placing him in the top one percent people in the world who achieved this feat.
The boy has also scored the highest mark in the second test, known as the Culture Fair scale. He got 152 in the second test.
Garg, a student of Reading School, a grammar in Berkshire, is also working on the development of an app. The app connects people who are interested in socialising with new friends in the same area.
Surprised by the result, he said, “I was looking for something to do over the summer holidays and so I thought I’d try taking the test.”