You'll find all the info you need related to the sandbox and sandbox invites here:
http://university.utest.com/invitations/#sandboxprogram
Also make sure you read this topic:
viewtopic.php?f=26&t=1611
Your profile completeness is above 90% so it shouldn't impact the invites, but just in case you should make sure your profile is complete and that you haven't skipped anything important, here's a list of the info you need to input to have 100% profile completeness:
Personal Info (city, phone, birth year, gender) - 2%
At least one computer - 10%
At least one mobile - 10%
At least one experience & skill - 10%
Avatar Photo - 3%
Basic Info - 30%
At least one testing types - 3%
About me - 5%
At least one application type - 2%
Testing expertise completed (if functional is selected, you need to selected at least one function to complete it) - 25%
Note: For example if you choose to not participate in mobile testing, and not input a mobile device, your profile will not reach 100%, but this lower profile completeness will not prevent you from joining opportunities in your chosen testing areas.
http://university.utest.com/invitations/#sandboxprogram
Also make sure you read this topic:
viewtopic.php?f=26&t=1611
Your profile completeness is above 90% so it shouldn't impact the invites, but just in case you should make sure your profile is complete and that you haven't skipped anything important, here's a list of the info you need to input to have 100% profile completeness:
Personal Info (city, phone, birth year, gender) - 2%
At least one computer - 10%
At least one mobile - 10%
At least one experience & skill - 10%
Avatar Photo - 3%
Basic Info - 30%
At least one testing types - 3%
About me - 5%
At least one application type - 2%
Testing expertise completed (if functional is selected, you need to selected at least one function to complete it) - 25%
Note: For example if you choose to not participate in mobile testing, and not input a mobile device, your profile will not reach 100%, but this lower profile completeness will not prevent you from joining opportunities in your chosen testing areas.