Regarding asking for writing about some courses in my CV in which I got bad grades due to my non interest in those courses
My general advice in such situations is to stress the positive in any application. Show the reviewer that you are a good candidate for success both in background and in work habits. Don't focus on explaining things that aren't positive but be prepared to respond when/if asked about them. 

While the competition for a slot in a good university is very strong, nobody is perfect. And you won't know how competitive you are until you apply. 

If you have a fairly narrow focus you intend to follow in graduate studies, focus on that and how you are especially well prepared to work in that field. Be enthusiastic, not apologetic. 



Caveat. I don't know how your grades are interpreted by your own university, not how they will be seen when you apply. But focus on the good stuff, not the bad.