Heya, what level and subject was this for?
You're not going to get penalised for crossing stuff out, that's ok.
So don't worry!
Did you make it clear which questions you were answering? Did you write the title of the questions? Examiners aren't heartless, they'll normally try to work things out, so unless it's particularly vague you should be fine.
If you come back with an unusually low mark for this exam, ask for a transcript of the paper from your school to check that the examiner marked your questions properly.
If not, then you can send it in for re-marking!
Don't worry about this now, just wait til your results come through and take it from there.