How to add a timeline to my CV?
Not putting the summary of your educational information at the top of the CV would look strange (since that's essentially the universal standard).

However, what you could do afterwards is have a "blended" list of your educational/research and professional experience (in backwards chronological order):

X1-Y1:  Most recent experience/job/schooling/miscellaneous  
X2-Y2:  Next most recent  
X3-Y3:  Next-next most recent
. . .


and so on.

But I don't see how there would be any real confusion if you use a standard layout and explicitly write out the start and end dates of the different experiences you've had, unless some of those also overlap. (Even then, though, I think you could explain part-time work and study accordingly.)