You will be told not eat or drink anything for the 8 hours before the test.

No sign of drugs or anything, though it'll be a while before all the test results come back.

You know your child best, so allow enough time before the test to explain what will happen.

The night before the test, get a good night's sleep!

For example, if possible you should get a good night's sleep before the test.

You may not be able to eat or drink for several hours before the test.

You will usually be asked not to drink or eat anything for several hours before the test.

You will likely be told not to smoke or eat for a period of time before the test.

I mean, there's no way to try the changes before the test, so we'll have to live with the results.

Before the test, let your child know what is going to happen.