Book request: I thought this was a book by Pete Johnson, but I've gone through a lot of lists of his books and can't find what I'm looking for, so maybe I'm wrong or it's one of his more obscure ones.It's a book and a sequel which both centre on the same group of three teenagers, a boy and two girls. One of the girls is called Mikki and I think she is the "weird kid" of the group although none of them are particularly popular. The books are just about their day-to-day lives, school, friendships etc. Specific things that I remember:Mikki has a "special tree" in the grounds of their school that she likes to sit under, and anyone who disturbs her there gets their head bitten off.One of the girls is getting ready for a party and thinks about what to wear. She asks herself "Who to be, who to be?" and decides she is going as "grunge me".(view spoiler)[ I think Mikki eventually dies in one of the books, possibly by suicide, and the other two have to come to terms with her death  (hide spoiler)]I read it in the early-mid 90s and think it was quite new at the time. Any help appreciated.

Matching book description: Because everyone around us is being so immature and dishonest, we the undersigned solemnly swear to keep a diary in which we tell the truth, the whole truth and nothing but the truth about the important things that happen to us and what our feelings are. When we leave school to go on study leave, we agree to swap diaries so that each person can read what the other has writ Because everyone around us is being so immature and dishonest, we the undersigned solemnly swear to keep a diary in which we tell the truth, the whole truth and nothing but the truth about the important things that happen to us and what our feelings are. When we leave school to go on study leave, we agree to swap diaries so that each person can read what the other has written - NO MATTER WHAT.For Mikki, Wayne and Bron, being truthful about themselves, their families, their loves and friendship has totally unlooked for results. ...more