WinSCP is one of the most popular applications for Windows allowing to manage server files via the SCP and SFTP protocols. It can be downloaded free of charge at https://winscp.net/eng/download.php. Download the program and install it on your device with default settings.
To remotely connect to the University's servers (galaxy.agh.edu.pl and student.agh.edu.pl) via the SCP and SFTP protocols in order to manage files and folders (uploading, downloading, etc.), you need to be located within the University Computer Network or connect to it remotely via the VPN connection.