Would a tummy tuck help with scar tissue?

Hello and thank you for your question.   A tummy tuck can remove all the scar tissue from previous c-sections.  It advisable that you wait until you are done having children prior to a tummy tuck.  When the time is right for surgery, a tummy tuck can be done through a low and short
incision, all completely below the bikini line. 
The belly button can be designed to look natural and have no scars on
the exterior.   Your muscles can also be
plicated resulting in a flat abdomen. 
Make sure you specifically look at before and after pictures of
real patients who have had this surgery performed by your surgeon and evaluate
their results.  The most important aspect is to find a surgeon you are
comfortable with. I recommend that you seek consultation with a qualified
board-certified plastic surgeon who can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.
Harvard-trained plastic surgeon

A revision of the c-section scar would likely be helpful and adding a tummy tuck with liposuction will help the overall contour. If you are thinking of additional pregnancies, I recommend you wait. No reason to go through the surgery and have the result compromised with the effects of pregnancy. Best wishes.