The errant driver, identified as a 35-year-old hotelier, Harsh, has been arrested by the police and booked under relevant sections of IPC, said DCP (south-west) RA Sanjeev.
According to the police, the incident was reported around 7.30 AM when the IAS aspirant, Kavita Sharma, was on her way to the examination centre.
Sharma had just crossed the road near the Todapur traffic signal and as she was about to climb the pavement, a speeding Honda City car allegedly hit her from behind. Even as Sharma fell on the road, the driver shouted at her and fled the scene.
Sharma, a native of Raipur in Chhattisgarh, lives at a rented accommodation in Todapur area, where she had been preparing for the Civil Services exam.
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When the car was tracked down, a hotelier named Abhishek Joshi - a resident of Patel Nagar - turned out to be its owner.
When Harsh was questioned, it emerged that he was driving the car and it was Joshi's mother sitting next to him. They had gone to a temple near Rajendra Place and were heading towards Naraina. Joshi's mother left for Mumbai later in the day, said the official.
Harsh, who is a resident of Karol Bagh area, was arrested immediately and further investigation is underway, the official added.