Click on 'IELTS Academic' in the menu, and you will be taken to the IELTS Academic workbook, where you will find five tests that you can try for free. If you want to try more tasks, you must subscribe to +Test Zone. First you must create a profile in Write & Improve. After you create your profile, you can click directly on 'SUBSCRIBE'. It's the blue button at the top of the IELTS workbook. This button will take you to the place where you can subscribe for the 52 IELTS tasks.