The initial assessment is an exercise around calculating the average colour given shapes. Eventually, you will be required to use some sort of recursion as the shapes can contain children shapes.
The technical interviews are a snake game, digital clock and a "UI Generator". This last one is given an object (with properties that can be objects too), generate a form. When any input is updated, log the new value. This exercise is quite poorly worded so it might take a while to understand what they actually are asking for.