The ‘standard algorithms’ we are expected to know and recognise at GCSE are specific to Sorting & Searching. (See Searching Algorithms & Sorting Algorithms).
In your exam, it is likely that you will be shown or asked to write algorithms using pseudocode. There are some basic syntax rules that will make it easier for you to do this:
Instead of = use <– For example, instead of x = 5 you would write x <– 5
Loops have a start and an end:
WHILE x < 5 DO OUTPUT x END WHILE
Write your key words in CAPITALS – you won’t actually lose marks for not doing so, but it makes your pseudocode clearer, and the clearer that it is, the easier it is to mark!