library.eshikshya.org appears to be a small-scale project serving an offline digital library called Internet in a Box, often used in schools or remote areas. The site does have an About page, which is a good sign, but it's missing several basics that would make it trustworthy for anything beyond casual browsing.
The biggest concern is the absence of HTTPS encryption. If you use the feedback form, your name and email address are sent over an unsecured connection, meaning anyone on the same network could read them. Legitimate educational platforms that collect any user data almost always use HTTPS. The site also has no contact information, no social media presence, and no history in the Wayback Machine, so there's little to go on if you want to verify who's behind it.
That said, no blacklists or malware have been reported, and the site itself is just a static content viewer. If you're only looking at the material, there's little risk. But if you're asking "is library.eshikshya.org safe" to submit personal information, the answer is no — not until they enable encryption. For now, treat it as a read-only resource and avoid entering any data.