The first round was a test, they conducted the test on mettl.com.
The second round was a group discussion.
It had 2 sections, one tested the basic 10+2 knowledge of the candidate. It had questions ranging from class 12 physics to basic mechanical engineering subjects.
The second test tested the basic knowledge of HVACs. The questions were from psychrometry, basics of refrigeration and air conditioning, the chemical composition of R32, R410a, etc.
The overall test was easy but can't say if it had negative marking.