IBM Associate System Engineer interview questions

There was only one round of interview where they mostly asked to describe the previous project works and how I could've improved it and made it scalable. They also asked questions related to my favourite subject and wanted me to explain a concept from it.

3-4 rounds- aptitude, English grammar, technical+hr. Aptitude difficulty level is medium. Maths knowledge would be helpful. If you clear the aptitude round, there is 80 percent chance to get selected in the interview. Only aptitude round matters.