Does anyone have any advice for the grade 7 sight reading? Ive noticed the sample pieces seem longer than previous grades, and the melody isn't so easy if that makes sense with the key signatures and accidentals. What is the main thing they are looking for? I find it quite difficult, especially the time signatures!

You need to aim for correct rhythm, keep a steady pulse and show an awareness of the tonality (make sure you know what key you are in).

Someone else might come up with more but I think that those are at least some of the essentials.

Yes, it's keeping the pulse that they're most concerned about. Playing something musically is important as well. Above all, do not stop ! Practice doing that at home. Go through all the Paul Harris SR books, even back to Gr 5 to build your confidence and practice counting out loud as you play and spotting 'elements' (e.g. rhythmic ,scalic, arpeggio patterns etc. ) as quickly as you can.

Apart from the sound advice already offered, look out for answering phrases between the hands, maximise the effect of expression marks including articulation, phrasing staccato etc. Try to let the examiner see, from the expression on your face, that the piece is affecting you and try even to make it your own - perhaps a little rubato if relevant and appropriate. There's nothing mystical about success in SR. You've come quite a way already. SR is something which nearly always improves as the grades progress; I know it gets harder in the exam, but hopefully as you mature as a player, you lose your fear of it as an unknown quantity and can even anticipate what is coming next - from your theory knowledge - e.g. chord progressions etc.

Try to enjoy!!

LR

Oh yes, I forgot to say - pedalling is another biggie which might, when used judiciously, impress an examiner.

LR

I'll second this recommendation for the Paul Harris Sight Reading books. All my students use them, and more than anything I see a dramatic improvement in their confidence.

Remember that it is all about pulse & fluency. Resist the urge to stop & go back & correct mistakes when you practise at home. Imagine you are accompanying someone, where there is no option to stop playing.

Good luck

I'll say it again, never ever stop. Dynamics are a good thing to do as well, have a look at them before you start.
Check the tempo marking, if it's adagio, luck you! If it's presto, take it with a pinch of salt, just be aware they sometimes work in your favour. I will "third" the Paul Harris books and also just read anything you can get your hands on, have a go at the other pieces in your books, anything! Good luck!