Just looked up the episode list and I think it went bad from series 5, episode 11 - the storylines were just badly written and there was no continuity. It's picked up again from episode 6 this series. So you could easily catch up on iplayer.
I think it is terrible, sorry. I watch it basically to see what my DD is watching and I am shocked by how banal it is. The Headmistress is dreadful and her mood changes in a heartbeat. Writing is shallow and one of the main characters (Caretaker's son) looks about 30!
Is he really 25? I thought he was younger. He does look older than Cris though...
The storylines have always been cheesy. So 2 girls pregnant by the same boy isn't too bad, I think. Should be interesting anyway! I didn't like how different Karen's reaction was with the two girls. And she should have apologised to her DD rather than a lame "I didn't handle that very well. Oh well, I'll be there for you!"