Google Webmasters Tools support
In order to check health of the website in SEO, webmasters tools provided by google is effective. The Content Keywords and Internal Links are useful to check it.
By checking them, we can know which pages are analyzed by the search engine. If it assume the page is not eligible to analyze, it doesn't. Therefore find the low quality page and write additional content in the page.
You can check the health of the pages by checking last crawled time and detected keywords and internal links.
Click "Analyze with sitemap" button from the top of administration console. Then following page appears.
Input the url of the sitemap and click "Import and Analyze" button, then download the sitemap and check it with the content keywords and internal links data.
By ordering records by the Last crawled time, you can check SEO health of crawling. Highly evaluated pages are frequently crawled, and not eligible pages are not crawled often.
The pages eligible to list in the SERP are analyzed both internal links and important keywords in the pages. By ordering records with them, you can check how the search engine evaluate your pages.