Hi, As I had told earlier Research interviews are not like GATE exam were only basics are checked. But it is simpler because we need to concentrate only on a few or even 1 subject unlike 10+ for GATE. i.e., we need more depth than breadth. Since I have no depth in other areas I'll just give a few topics to read in Systems area and in particular high performance computing. I put it as a question and not a blog so that I can add materials as answer here.