One of my friend appeared in Headstrong interview for fresher's.
Round 1: Written test
This round have written test and if you clear this round only then can appear in next round of interview. This round include 50% c questions and 50% non technical questions like quantities and reasoning.
Round 2: One to One Technical Round
This round have face to face technical round and can ask subject like C, C++, java and data structures, OS etc.
Round 3: HR Interview:
you will be asked HR round of questions in this round . Once you clear this round will be awarded with a offer.