Data Science Specialization – First 2 courses

I am interested in taking the first two courses together.  As a principal engineer I already have a pretty extensive knowledge of the tools listed and some knowledge of R. I see that it is advised to take the 1st course then the 2nd and others can be taken in parallel.  For those of use who already have a strong background is taking the first two course in parallel feasible?  Seeing as the 1st course has a low time requirement I will have extra time to invest into the 2nd course. I wanted to hopefully get some feedback before I head down this path.  Have others done this and have they struggled?

Does this specialization fall under the signature track and have a proctored exam at the end?

Source: Data Science Specialization – First 2 courses

Via: Google Alert for Data Science