I will go straight to the point.

Before you apply for adsense, make sure your website meet up with Google Webmaster Policies and Adsense Policies:

A. Test your site:

Check how ok your site is by using sites such as:

1. https://varvy.com

2. https://yslow.com

3. https://developers.google.com/speed/pagespeed/insights/

B. MAke sure you have original contents created by you.

1. You can use the google search string below to check if you have any copied articles on your site:

>>> a. In the Google Search Box, enter the following:
publisher:yoursite.com

hit the search button and you will see results of archives.

2. Don't copy any image from the internet... it is better to create your own simple graphics in coreldraw.

3. Avoid keyword stuffing...

4. Make the web better...