How would I go about rooting the Cubot H1

I am about to buy a Cubot H1 (http://www.cubotmall.com/cubot-h1.html) How would I go about rooting it. I do not want a custom ROM I just want root access. Cubot H1: 5.5 inch HD screen, has 2GB RAM + 16GB ROM with MT6735P Quad Core CPU, 8MP front + 13MP rear dual camera, installed Android 5.1 OS. Would OneClick Root work?