visa 190

#1
I applied for visa190 on 23/May/2016 and then the case officer asked me to provide form 1220 and CV on 29/6/2016 after that they contacted me again on 10/10/2016 asking for my passport pages' scan,polio vac., Character Statutory Declaration and War crimes declaration then they emailed me from skilled department to ask my education history. My question: is it normal to ask the applicant many times? Do you think there is something they will ask me about it in the future? Any hint about what is the next stage (decision or more info) Thanks Ali/Iraq