Here are some practice papers for you to try. They are helpful as they show you the kinds of questions you may be presented with.

The majority of the questions do not require any prior learning of the concepts in Science.
All questions require you to use your data processing skills!!!
That is, to look at the image/data/graph/statistics given and then choose the correct answer that relates to the data.
It is the data that is provided that is the key to answering every question.

The questions are often challenging, but many appear harder than they actually are.
READ the questions carefully.

You will need to bring a 2B pencil and an eraser.

Anyway... try these practice papers at home, and you'll have a good idea of what to expect on the paper.

Best of luck,
Your Science Teachers

Practice questions from the ICAS website this year (answers are at the end of the pdf)