網上邊到有for小學生那些Cambridge KET,PET,FCE之類英語測試的EX~

go to the website of:

British Council (Hong Kong)

You can find exam.

Then you can follow the link to the required information.

There are also books of past paper in the bookstores. You can buy and practise but the proble is for speaking, you cannot practise alone and you do not know if you speak in the correct way or not.