... I am glad to inform to you,which your site is a
one of the best site about Informatic Olympiad in the
whole world, especcially for schoolers, according with
to the pedagogik mastership art. 
    But for My means, have a little imperfections in
your site.
   1. Speed of your server for any customers query and
answer is slow.
   2. Why in your site not have a any open tests for
each tasks of training? If customer layed in very long
distance from your server,especially not have a direct
connect and good server,  this problem had a very high
actuality. In addition, number of query is a low.They
have concerned for training problem and problem of
theory,in which have need the learner, who want to
selftesting.
All of above mentioned is for my meanings

Best Regards

Jagi S.
(Mongolia)