Does the Anchor Text has to be unique?

[Brackwom]

A clickable hyperlink is attached to anchor text on a web page. When linking to another source, whether it's another URL, a PDF document, or any other online media, you'll want to employ anchor text.
The link text should be unique among all of the links on the page, or the link's unique function should be able to be understood from the context of the link. This aids in determining a link's role and distinguishing it from other similar links.