Folio3 Associate Software Engineer interview questions

My interview experience at Folio3 was straightforward. The focus was on core concepts: OOP principles, database topics (joins, normalization), and fundamental data structures (linked lists, trees, arrays, stacks). IQ problem-solving was also tested with puzzles involving coin weight and water jug capacities. Overall, the interview covered essential technical and problem-solving skills.

They had total 5 steps , the first step was an mcq conducted during job fair at our university fast then on-spot short interview. After that 3rd was a coding assignment, then 4th was another Technical Interview and 5th was also Technical Interview. Around 60 cleared till interview 2 then remaining only 6-9 candidates were called to attempt coding test step 3 , and 4 of the students cleared all 5 interviews. After all this process , the HR emailed the successful candidates that they cleared the interviews but they do not have any vacancies. So what was the need of all these interviews of you do not have any vacancies? HR getting bored and scheduling random interviews ?