If you can't find an assessment on your device, please ensure your device is connected to the internet and then make sure you're in the 'Assessments' section of the app before you synchronise. If the assessment still does not appear, try logging into the web interface (https://aru.mkmapps.com) and searching for the assessment there. If the assessment doesn't appear on either interface (that is you can't find the assessment on either the mobile device or the web interface), please raise a support ticket, also, please make sure you include the title of the assessment you're expecting (if you know it) and your Myprogress username to help us fix this quickly.
For more information on connecting to Wi-Fi, please read How to Connect to Wi-Fi
For more information on synchronising your device, please read I have completed an assessment, where has it gone?