How can I embed a form to my FB page and have it redirect to an external page after submission

How can i create a form in FB which directs to a website? I would like to add a Result button which should redirect to my "SBI Clerk exam" site.

If you meant you wanted to embed a form on your Facebook Page, have a look at the detailed guide below.

Complete guide: Adding-a-Form-to-Your-Facebook-Page

And if you plan to redirect your users to an external page after form submission, you can setup a redirect URL as the THANK YOU PAGE.

Complete guide: Redirecting-Users-to-a-Different-Page

In case we misunderstood, kindly get back to us with more info and a better description of what you're trying to achieve so we can better assist you.