made cake mark 1 at the weekend and its a disaster , i am having to use the top oven as the bottem one is broken,would the cake cook at 100c as it burnt at 150c ? should i cover the top completely as i covered it with a double layer of baking parchment with a little hole in the middle but the cake rose to the hole and burnt and cracked . this is my first attempt at cake so any advice gratefully recieved