Is there any way to get every post in moderation first?

Hi Kritik, 

Yes, there is a workaround. 

In the moderation app setting, you can add a large number for the "minimum account age" or "minimum reputation". This way, as no account is old enough or no user has enough reputation point to skip moderation, posts from all your members will be sent for the moderator's approval. 

You can learn more here8.