Ok, so I get there can be no gaps in time, but is it ok to have an overlap in time?
For example
I went to Uni for 4 years, and also worked part-time for about 3 years during that time
so...
02-2009 – 06-2012 – studying at University
01-2009 – 02-2012 – working at blah blah
05-2008 – 12-2008...