No test was conducted. Some people were shortlisted for elimination rounds of interviews.

Round 1
Introduction
Projects - Explain, Your part, challenging part?
Why this tech stack
Used OOPs in projects?
OOPS questions?
Tech stack questions
Reverse string On/2 time approach (Swap without temp variable)
CSS Flexbox
Used testcase tools?
Agile methodologies

Round 2
Introduction
Projects
Questions: (Might originate from what you said earlier)
Operator Overloading Code for said example
Operating system
Realtime OS
Mutex
Semaphore
Memory types
Heap
Stack
What's in stack
How to create object on heap
Types of errors
Runtime error
Python Compilation
Constructor types
Copy constructor
Deep copy
Shallow copy
Pass by reference
Pass by value
Deadlock
Deadlock tackling
Scripting program
Binary programs bit operations
Logic gates
Truth table
Python
Exception handling C++
Embedded programming
Embedded projects
Python lists
Python floor division
Python power operator
C Programming
System calls programs
Child, Parent process
Zombie process
Interprocess communication
Shared memory
Why to use shared memory
Pipes
Message Queues
Polymorphism
Virtual keyword
BIOS
Booting process
Struct vs class
friend function

Verdict: Did not get the offer.
P.S: Person with lot of paid Devops Courses, projects, certificates was selected after Round 1 only.
On campus companies only consider your 10th, 12th and CGPA for initial shortlisting and not JEE mains marks. Even questions might be from outside your college syllabus.
Tip: More people were taken for software role than firmware or Post Silicon validation