Ok do you want to get past it you Have to get past the dogs with the Luminus spell and They fade away you go all the way into the back then you Crawl into the hole there is also another hole in the next room you go through that . Then you see Ron and When the Eye is like sparkling Blue, you do the one spell that you learned first after it dies you win that level and you are at Hogwarts

... in order to hit the eye with your Flipendo - use your target lock on the hands of the tree once locked on one or the other hand, use your flipendo(the willow then waves Ron all over the place) leaving the Eye open to use Flipendo on it!

Listen you come down the willow tree and then you go to the right of the roots and you
will find a hole covered in roots do a spell on it and you will go through,then go through
the imps to an empty ground ther u shall fight the dogs use the light spell to kill them!!