Theoretical material can be found in your Student book, but also here and here.

If you are interested in special cases, have a look here.

Here are some exercises to try after going over the theory:

Positive question tags (easy)

Negative question tags (easy)

Mix and match exercise

Multiple choice exercise 1

Multiple choice exercise 2

Multiple choice exercise 3

Multiple choice exercise 4

Multiple choice exercise 5

Final exercise - fill in the correct answer

After you finish practising, you should try these two tests:

Quiz 1

Quiz 2