Most of the ESE aspirants in E&T Engg. Discipline face the problem in preparing for the most dreadful subject i.e. Computer Organization and Architecture. To give my brief introduction, I have done my B.Tech. from NIT Jaipur in 2017 in Computer Science and Engineering Branch with a CGPA of 9.1.
To make your task simpler, I have made an entire course on Computer Architecture, Operating Systems and DBMS. You do not need to refer any additional material for ESE as this course covers all the concepts in a greater detail. You can fully rely on this course. I have also tried to add various practice questions, ESE previous year questions and conventional questions so that a beginner in this subject can get familiar with this subject easier. If you face any problem while preparing for this subject, you can ask without any hesitation.