I need more practice.
Tennis practice is at 10 am
I practised every day.
Do you want to practise English with me?*
American English doesn't have this distinction. In AmE, both the verb and the noun are written as practice.
* This follows the same pattern as advice (noun) and advise (verb). However, while advice and advise are pronounced differently - with an /s/ and a /z/ sound respectively - practice and practise are both pronounced with an /s/ sound. And while AmE doesn't use the verb spelling practise, it does use the verb spelling advise.