We used Recaptcha developed by Google. So it is very difficult to crack by spammers.
Some other minor fixes were suggested by http://seositecheckup.com/.
Test Report - here
We improved score from 65 to 71.
Useful for search engines to find the website.
Test suggested poor site loadup time ~ 9 secs.
This is the bottleneck of free hosting.
Security plugin "WordFence" & "Sucuri Security" suggested by the quality team was used in the website.
This made the website very secure.
Security test results