1. I’m not good enough to play you at tennis. I need more practice.
2. If you want to be a professional dancer, you should practise at least 6 hours a day.
3. Pepito went to Paris for five months to practise his French.
4. You know what they say, “practice makes perfect”.

Practice is a noun, to practise is a verb (but only in British English.
In American English, practice is both a noun and a verb)