Integrative level is a way to measure how much of a particular task you understand and can do. It means that you can do more than just the basics of a topic, but can also analyze and use your knowledge to solve complex problems.
Think of it like building a house. At the basic level, you might know how to lay down some bricks or build one wall. At an integrative level, you can look at the whole house and put together all the pieces to make an entire structure.