1. Test Website homepage –> Open Moz Bar ( Check Title, meta keywords, meta description ) – Also check the keywords search volume.
Tools Used: MOZ bar: https://moz.com/products/pro/seo-toolbar
2. Test Website backlinks: As much as possible (relevant too)
Tools Used: http://smallseotools.com/backlink-checker/
3. Test Website page load time: should be less than 10 sec.
Tools Used: https://tools.pingdom.com/
4. Test Web page Speed Insight by Google: should be above 70%
5. Test page internal links
6. Test Website Mobile Responsiveness: Should be mobile responsive.
Tools Used: http://responsivetest.net
7. Check Website Contact form: should be at many places to grab visitor.
8. Check Brand building: Address, no. and google my business registration.
9. Check Website Sitemap: xyz.com/sitemap.xml (should be there)