Translation of chévere in Spanish

Let in rain again. I love listen to music on the weekend while it rains. When I used to live in Darmstadt I hated the rain, but since I live in Greece, I love it because it does not rain that often here.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
I have problems with adjectives, endings and articles. The grammar is so difficult. I am very happy to learn Spanish with you. What went wrong with the lessons? Thanks and best regards.