Um the first part of 2 and the 2nd part of 2 are two very different things. I know lots of people who pass the language test to get into college but make a lot of grammatical errors. Also basically require spellcheck/chatgpt to write a basic email. Also even my roommate makes grammatical errors in conversation and she has to do her job in her second language. You seem bilingual to me, seems kind of silly you seem to think you need to spent a year in England or something to be considered bilingual.