Howrse does not have any more riding levels.
Riding levels run from 1 - 10 on Howrse, the same as achievements. There is no level 20.
There are only 10 riding levals (gallops) on howrse If you want you can PM me on howrse my user is lulujake8.
riding level 2 and you have to be on for 10 days before you can pass that riding level
after 10 (i think) days on howrse (i mean days you go on howrse) you need to have done riding level 1 then go to the riding level page and take the test. Yeah it is 10 days but you have to have logged on for 10 days and done your 1st riding level like you said Riding levels no longer exist on howrse so you can't get to riding level 2 any more. Its equvalent is now 10 days of seniority (you log in 10 times on 10 different days.
You do not get anything, it is just a bonus level
Riding Level 10 answers for V2 can be found here: http://www.howrse.com/centre/forum/sujet?id=214444&sujet=854346
Riding Level 2 10 days registered - Riding Instructor
You have to be registered on howrse and have logged in for 10 days.
Riding Level 10 (Bonus Level) 200 days registered - No prize, but the honour of having achieved it
10 days registered - Riding Instructor
You must have 10 days registered.
Howrse have stopped doing Riding levels now but you used to have to have 10 days seniority and answer some questions on the My Riding levels page. Hope this helps