not really that much use.
I am a second yr electrical engineering student and a laptop will not do much at uni. There are plenty of places around the uni you go to to get a computer if you need one at uni , theres the physics study room, the red centre with the maths computers and the school of electrical eng/ telecomm has a computer room specifically for students of the school.
Engineering is very kind of "hands on" topic , you will be usually following lecture notes that the lecturer has ( hopefully) put online before your lectures. For example in maths and to a lesser extent physics you will be going through examples in the lecture and you will have to write down solutions etc. you cannot really do this very easily on a computer ( unless you have maths symbol software and can type it fast )