Hello
As per my understanding you are looking for a Moodle Expert who can assist you on Ranking Block as per your specific requirement & must support Arabic Language.
We can assist you with Ranking block which will work simultaneously with your an existing Moodle [login to view URL] soon as the course will complete the block monitors these activities and add points to the students as per provided criteria like gaining points,ranks etc.
As a Moodle Expert,I can develop,customize or custom develop its any kind of Module, Block, Plugin,Functionality as per the require specifications.
I would like to tell you that I am working on Moodle platform from last 7 years.I have worked on its different versions such as 1.x, 2.x and now 3.x.
I am looking forward to discuss the job specifications with you so that after i can tell you approach and estimate accordingly.
Highly Thanks
HS Virasat Solutions