The selection process for Makers is tough but there is no "golden number" that we aim for.
If you're applying to Makers, you're someone who's looking to change their life. We want to see your drive and passion to commit. Part of this is demonstrating that you've prepared properly before you submit your application and you aren't afraid to be in an environment where a lot of the time, you won't know the answer. If you can show us this then you'll dramatically increase your chances of getting in.
If your application needs work, we'll guide you to impove but it's up to you to make it happen.