Liebert
William from China
For HSK1 and HSK2, only listening and reading, No writting test,
But for HSK3, HSK4, HSK5, HSK6, they all need writting
So you had better learn how to write it if you want to master higher level Chinese
Please note that China Mainland uses simplified characters, while China, Taiwan and Hongkong use traditonal characters. My advice is that you learn simplified one, which is easier and most popular.
Hope it helps