What is new site level approval process in adsense and what is AFS

What is the adsense new site level approval process and what is tax residency certificate issue

just apply for adsense.
if you are asking for how you can get adsense approval, then you need to understand why google will give your site adsense approval, any benefit? is your blog getting traffic? ranking higher or anything that makes google believe you must get adsense.