screen keeps jerking and there are automatic touches
From your description, there are two obvious possibilities. The first is that some static electricity or oil on the touch screen is causing it to think you're touching it. Try giving the screen a good wipe. Also, earth yourself by holding a metal water pipe with one hand, and cover the screen with your other hand.

The alternative is a manufacturing defect in the touch screen. Faulty touch screens are quite a common problem with cheaper tablets. If you can manage to do this with all the false touches, try to install a paint program from Google Play and run it on your tablet. Leave the paint program running for a few minutes, and any false touches will paint on the screen. You can see where they are happening. You may see a pattern to them, such as all being in one strip of the screen, or always at one point. That would confirm that it's a fault in the touch screen, in which case you should return your tablet and get it replaced.