On my laptop I have installed Win 7 and VS 2012.But I need to get ready for the Microsoft exam for the "windows store apps using HTML 5, css and javascript". So my idea is to install Win 8.1 and VS 2013 trial versions for get hands on practice for above exams.So my question is can I install Win 8.1 and VS 2013 trial versions on my Laptop without removing the current Win 7 and VS 2012 (Maybe a virtual machine or something like that)?If you know how to achieve above goal please let me know.

In short my whole idea is to get practice for developing Win 8 apps for mobile. If you have other suggestions without installing the above software, please let me know also.