If you are a sophomore, write a unit training paper. I can't write a comprehensive paper because I haven't learned much.

Generally speaking, exercise books are better than papers for senior two students. Because there are examples in the exercise book, it is very important for senior two students who still need to learn new knowledge to see the method of summarizing examples.

But your situation is quite special. According to your information, I think you can write a topic, but it is difficult to concentrate when writing. Therefore, it is suggested that when writing a paper, try to imitate the exam, give yourself a time limit, and don't interrupt halfway. Don't write papers as exercise books. Exercise books are used to consolidate knowledge, while writing papers is to overcome the problem of difficult concentration.

As for which brand of paper, it feels the same. Recommend the century gold list. I have used it before, and it feels ok.