就算is like even though, so if u say “even though I’ve read books a little, worked a little, I still didn’t feel it was enough.” The logic can be a bit strange. 注意in Chinese means be careful or pay special attention to something (normally a problem) In Chinese, we don’t mind repetition and in some occasions we actually prefer to use repetition instead of pronouns. For example, in the sentence “我画一半时间在看电视上”, saying 昨天 will be a lot more natural than 那天as 那天is often used to describe a day that’s like long time ago.