There are various ways to do this, but if you have access to LrC and you have sufficient storage space on your local system to (temporarily) store a 2 x copies of all the images in your Adobe cloud, then you could do the following:
1. Make sure you are logged into your student account on your desktop computer, then start LrC and create a new empty catalog (if you've not used LrC before on that system a new catalog will automatically be created).
2. Set the location for synced images to a hard drive that has enough space via the LrC Preferences>Lightroom Sync tab.
3. Then enable sync in the LrC catalog (click on the cloud icon top right to see the Start Syncing button).
4. LrC will then gradually download a copy of all the images that are in your Student cloud account, which will preserve all edits, flags and ratings and collections (albums in cloud speak).....BUT it will NOT preserve keywords and location data, so if you have used these extensively you might prefer to use a different method.
5. Assuming you are happy with the download, log out of the Student account via the CC Desktop app, and log in to your new account. Then start the Lightroom Desktop app and use the catalog migration tool to migrate the LrC catalog.
5. The migration copies all the LrC catalog contents to a local drive (which is why you need 2 x the space), then will upload to the cloud, preserving all edits, flags, ratings and will create albums from the synced collections.
6. Once all is complete, you can delete the LrC catalog and the associated images. The second copy inside the Lightroom Desktop space should gradually reduce in size unless you have chosen to store a local copy of all originals ion the Lightroom Preferences.
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