How I would interpret what you have to do and how I would go about it: The focus is obviously the vocab you need to describe a holiday- when you went, where you went, with whom you went, where you stayed, for how long, what you did, what the weather was like, what you thought of the holiday. It's year 8- so you will need to intro and drill the vocab. It's 60 mins- so you will need to have exs covering listening, speaking, reading and writing- probably with some of the reading and writing spilling over into homework. They are top set- so you will need to revisit and practise the whole paradigm- I, you, he, she etc. They've apparently already covered the past tense- so ASK them when it comes to the grammar of the perfect tense, and have the pattern ready for them to spot and deduce/ reinforce/predict. Ppt is the best way to go as you can reveal it line by line.