Sort mysql query

As shown above, how to sort by the highest number of 11,5 appear?
This figure is obviously the first one should be allowed to 11,5,3 discharged<-! Main posts under Banner (D4) -><-! Posts under the main text (D5) ->
Reply:
select nt.nickname, nt.account, nt.pic, nt.ofusername, nt.tagprimes
from (
select ...
union
select ...
) Nt order by nt.tagprimes desc
Is that OK?

Reply:
No, I'm talking about the number of occurrences of up 11,5
Reply:
Resolved, as
---------------
SELECT u.id, u.nickname, u.pic, u.gender, u.ofusername, readgrade.value, u.doreadbook, book.name, u.profile, u.age, u.tagprimes
FROM app_user u
LEFT JOIN app_source readgrade ON u.readgrade = readgrade.value AND readgrade.stype = 'readgrade'
LEFT JOIN app_book book ON u.doreadbook = book.id
WHERE u.tagprimesum% 2 = 0 OR u.tagprimesum% 3 = 0
ORDER BY IF (u.tagprimesum% 2 = 0,1,0) + IF (u.tagprimesum% 3 = 0,1,0) DESC