The SD card will be fine if you take it out of your tablet.
Put in your SD card reader and, assuming your laptop is Windows, you should get the notification box asking what you want to do with the SD card.
Choose to open and you will see your files. Delete the ones you don't want, and drag and drop the ones you do want to keep to the appropriate place - documents, photos, videos, wherever you choose, on your hard drive.
Alternatively, create a folder on your hard drive and copy all from the SD card to the folder.
It really is no different to saving, deleting, copying, moving any other file on your system