Here are some links for your exam preparation. The more you practice, the better chances of success you will have.
Before starting, you should know where you are. On the top left corner of the site in this link, you can take an exam to be aware of your level of English.
Below there's a link where you can test yourself online.
In this file below you will find multiple tests in PDF format to download in a self-study edition..
This kind of exercises have to be completed in a certain time, this site at Cambridge English allows you to choose the type of exercise and the time to do it.