The DEMO version only includes 10 pages:
http://mathpapa.com
http://mathpapa.com/practice.html
http://mathpapa.com/lessons/algebra.html
http://mathpapa.com/payments/upgrade.html
http://mathpapa.com/account/login.html
http://mathpapa.com/account/signup.html
http://mathpapa.com/algebra-calculator-q-1-2.html
http://mathpapa.com/algebra-calculator-q-1/3-1/4.html
http://mathpapa.com/algebra-calculator-q-2-3-2-2.html
http://mathpapa.com/algebra-calculator-q-(x-1)(x-2).html

It is possible to download these free files and install them on your server, so you can test how the site works.
Visit https://www6.waybackmachinedownloader.com/website-downloader-online/scrape-all-files/ to buy a fully functioning site.
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