Ajit Singh Gill studied at K.K.M School in Kuala Lumpur and at Teachers Training College in Singapore.
He was a Senior Assistant of a secondary school in Singapore.
He played hockey and cricket for the Selangor Indian Association from 1948 to 1951 and for State of Selangor in 1950.
He played for the Singapore Indian Association from 1952 to 1975.
He also played hockey for the Singapore Khalsa Association.
He played as right half-back for State of Selangor and as a full back for Singapore.
He represented Singapore in matches against Indonesia, India, Pakistan, Belgium, Britain, New Zealand, Australia, Malaysia.
He was a short corner specialist and states that "scoring all those goals was very thrilling."