I am a college student and my major is mechanical engineering. I am in the second year. We study in general about energy and its transfers. It’s funny, but for me the hardest [things are] part is the equations. When you want to solve any problem in this field you have to pay attention [of] to each step, because if you [did] make a little mistake in one step [that’s] it will affect the final answer. The exam is multiple choice, so if the final answer is wrong you will lose all the [whole point] marks for [this] that question.