One of the prerequisites for getting the MCSD: Web Applications certifications is the exam 70-480: Programming in HTML5 with JavaScript and CSS3. I’ve created a study guide for the exam, which provides links to various online resources for each objective as outlined on the Microsoft Learning site.
I took and passed the exam in July while it was still in beta. I found it to be a rather difficult exam, in the sense that JavaScript can be so incredibly browser-dependent. I thought some of the questions weren’t very good because it didn’t always seem like there was any rhyme or reason why certain browser-specific items were chosen to be tested on. But, please keep in mind that I was taking the beta exam and some of those questions might have been thrown out.
Another thing to remember: although the exam does touch on JQuery, remember that JQuery is an open-source code base, and as such Microsoft is not going to test on it as though it were part of its own stack. When in doubt, focus on generic JavaScript principles rather than doing a deep-dive into JQuery (but don’t neglect JQuery altogether).
Good luck studying!