I have suddenly been told I am moving from the job I have been doing successfully for the last 10 years to teach KS3 Maths, Science and History as well as my own subject. I am okay with basic arithmetic but know little about KS3 History and nothing about Science at any level. I am concerned about how I will manage to plan, teach and assess all core subjects plus History. I envisage being up til all hours trying to learn the subjects before I teach it to the kids the next day. Now in my middle 50's, this seems unreasonable to me and an insult to those who are qualified Maths, Science and History teachers. What do you think? I would appreciate the opinions of my colleagues on this one.