Most gap year 'jobs' are just fundraisers. Charities need unskilled volunteers like a hole in the head. They already have more local labour than they can use. They need trained teachers, doctors and veterinarians but of course few of those can afford to spend time working without pay. So they provide food and accommodation for rich kids who want to pretend they are doing something useful. IVHQ is yet another layer also taking fees.
If you want to use your gap year well, consider dividing it into thirds; one third to work, live at home and save up some money, one third to travel and one third to learn something useful. Of course if you already know what you are going to do after university, you can go right ahead and do a year of work experience. Not only will that help you enormously with your studies but it may also help you later get that all important first job. But don't worry if you do not yet know what you want to do, most people don't.