Cotha is an android app where you can get all the information about engineering books, which is available in PDF form. You can check the book's rating, download it to your device and read it offline.

How to use this app:

First, you need to register your account by entering your name, email address, and phone number. After that, you can log in with your credentials.

The books are categorized according to the year, the author, the subject, the topic, the language, and the publisher.

You can see all the books you have downloaded on your device, and you can also check the ratings of the books and the number of downloads.

You can also upload a book to the library and download it to your device.

This app also has a built-in file manager that can be used to download a file from a URL or a link. You can also use this app to download all the files from a URL or a link.