I noticed that there is a content module of Tanzanian Exams for RACHEL. My non-profit has an educational resource website for Tanzania (http://maktaba.tetea.org/) with (we believe) the largest freely accessible collection of Tanzanian national examinations. We’d be happy to share the exams with RACHEL if they would be useful.
That looks like a very nice collection - have you released the content under an open license? Or if you are able to give us permission to distribute the content, that would be great too.