See this kind of problem are quite normal. We all have some issues with some subjects. So don't get frustrated about it. See there are two possible ways for you in order not to understand Computer Science. The first issue can be that you have no interest about the subject and as a result you don't feel like studying it. The second issue can be that you don't understand the crux or the logic of the subject. If the second one is true then I would recommend you to consider some open sources like Youtube channels, Web blogs etc on the topics. In books you will get the theories but in the youtube channels regarding computer science you can get really good explanation of the conception with solved problems. This will increase your understanding of the crux and if you put some effort then I hope you will improve your condition. Now if you are not interested in the subject at all, then I would recommend you to prepare as much as you can by studying the previous year papers and analyze the portions from the questions are highly incident. If you can do it then you will score marks in your exam and you can choose your career options.

Now the second part of your question has a steady answer that if you have no interest in the subject then I would recommend you not to go for any courses related to CS else you will feel the same problem. Now if you improve your issues then I think it will increase your enthusiasm and as a result if you choose CS to be your career path then also you will not face that much of a problem.

**SO be wise when you choose your career. Your choice is the supreme reason for your success.

To know more about Computer Science visit the link below:

https://www.careers360.com/courses/computer-science-course

I hope this answer helps. All the very best for your future endeavors!