Are these levels good enough to go to grammar school?

I think you can't join a grammar school unless you passed the 11+. You can take th 12+ but I think it is too late for you to take that too. I don't think there is a 13+, I may be wrong. Conclusively, I don't think you can join a grammar school now until sixth form. However, I'm not sure, so don't take my word for it.