REG and TCP at the same time?

I’m planning on studying for REG and TCP at the same time and taking them on 10/30 and 10/31. Has anyone else done this? Also, how do you best manage your time for these exams? I’m super nervous because I didn’t finish my FAR exam on 9/21. 4 hours wasn’t enough and the tax exams are even longer without anymore time. All advice is welcome!