How to improve my writing skills! I need 'Help'

Hi
I have a writing final next week … I have to write three paragraph essay !
and I’m not good at writing essays, I’m always out of words and ideas, and I waste a lot of time thinking about something to write.

So could anyone please help me with this… I would appreciate it so much

50 Free Resources That Will Improve Your Writing Skills : 50 Free Resources That Will Improve Your Writing Skills — Smashing Magazine