It's better to say "справитесь" or "У Вас всё получится"
Слово "спориться" is old-fashion word and not to be used in present time.
Medved means word "запороть" = ruin. He just change "и" to "e".
Я запорол экзамен - I did't pass exam.
It's informal and I will say "bad" word. You shouldn't use it especially in formal speach.