Can someone tell me please, if there’s, for example, a calculation question, and the answer is wrong but you missed one thing out or made a single silly error, how many points would you get out of (for example) 6?
You will get some marks, but depending on what the ‘silly mistake’ is. If the mistake is made because the candidate fundamentally doesn’t understand the concept then more points would be lost.
On the whole CFAI spends loads of time debating each question so you will be marked fairly as possible, whatever your answer is.