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You can use below path for the cron job:
/home/user/public_html/script.php

If you are using cpanel control panel then you can easily create it in cpanel:
Login to cpanel >> Click on "Cron Jobs"...

Hosting companies providing Free hosting to enhance their business, people can use free hosting and then migrate to their paid plans.
We always have to upgrade account to paid hosting plan as free...

Thanks for help.
But i am beginner and its tough to check the graph format.