What should I do to improve my writing？

I am afraid of taking the written exam. There are four types: writing, listening, reading and translating. However, my biggest fear is writing. I don't know how to improve it. Before the exam, I will recite a lot of good sentences, but it's no use. Now, I have no idea. Who can help me? Thank you!

I assume that the exam you are going to take is English? Here are some tips that may help you:

1. Remember to capitalize the first letter of the first word in your sentence. Same goes for 'I' and for nouns. 

2. Don't forget to leave a space after the period or before the new sentence. 

3. Thesaurus is a big help when it comes to choosing the right words for your sentences.

4. Don't be afraid! Have confidence in yourself. It can help a lot! 

Good luck!