She is the daughter of late Gyanendra Rai and Roma Rai.
Aparajita cracked UPSC exams both in 2011 and 2012 and was ranked 358th in the UPSC exams of 2012 and was allocated the IPS cadre. She is 2009 BA LLB (Hons) student from the WB National University of Juridical Sciences and is presently posted in Hoogly in West Bengal.
Her callibre showed true colours as she won various prestigious trophies such as 1958 Batch IPS officers’ Trophy for the best Lady Outdoor Probationer, Shri Umesh Chandra Trophy for Field Combat, the 55th Batch of Senior Course Officers Trophy for Best Turn Out, and West Bengal Govt Trophy for Bengali.