you may get avoidance through those grounds as:

-continuing education at the moment for deferment

-being discarded as useless due to a permanent health defect deemed as an acceptable excuse for lifetime avoidance by obtaining a medical report from the competent military hospital

-having a temporary health excuse for deferment which is also to be certified by a medical report from the said authority

-one year deferment of a specific nature that begins in the completion of graduate degree (university graduate in turkey)

-exemption of the brother from the military service as long as his (two?) other brothers are already carrying out their obliged military services

ps. these are all I can remember but there may be additional reasons for evasion
hope this helps