Born in Thoubal, Manipur, Amarjit was part of the AIFF Elite Academy batch that was preparing for the 2017 FIFA U-17 World Cup to be hosted in India.

After the tournament, Amarjit was selected to play for the Indian Arrows, an All India Football Federation-owned team which competes in the I-League.

[2] He made his professional debut for the side in the Arrow's first match of the season against Chennai City.

Amarjit represented India national team in the 2019 King's Cup on June 5 in the opening match against Curaçao as he came as a substitute for Pronay Halder.

[5] He has made history as a youngster, moving from the India U-17 team to the senior squad in only 2 years.