六月的考试有experimental section吗？

no, you wont know which section is the experiemental section

but if you are good with everything else you do, then you shouldnt worry about this

because this section doubles or triples up your other existing sections.

well, you should just focus on your study sections, just the 4

if you want to try the writing sample too, that's ok, it wont be graded upon, but most law schools will still look at it.

the experimental section is only an extra section out of the 4 you are preparing, it shouldn't be a problem once you know your stuff already with the other 4.

and each section is allowed to have 35 minutes, so they shouldn't cut you down.

if you are good with your other sections

then you shouldn't have any problems, it wont be a waste of time