Imagination Technologies Graduate Device Driver Developer for Power VR Team interview questions

I got a call from HR that she found my resume from X website. and the Online C test is there within 3 days if i am interested. The test was moderate contains only subjects like >find error in code >what is the output >some predefined macros etc. after clearing that test the next was Tele interview the questions were >extern, Static, linking moduler programming C >some sorting algorithm and optimisation in C >some general bit manipulation algorithm after clearing the tele interview F2F interview was set in F2F interview they covered >optimisation of C code >string and bit manipulation in C >OS concepts and threads working in Linux(pthread library) some moderate kind of questions after that the meeting with the R&D Director was held he thoroughly asked about my previous work and past education(Be confident) and some very easy C optimisation question(read C internals memory layout and memory organisation) and some logical question. and thats it.