H1B Stamping question about my educational background

i came to US on F1 visa in 2008. then finished masters in 2011. then i was on OPT for one year. since then i was applying for H1B every year but it never got picked in the lottery. so i had to stay back on F1 to keep my status active. finally i got my H1B approved in 2015.

here is my question:

I spent 7 years on F1 status switching 4 different schools to keep my status active.

i got masters from the first schools then i did certification courses in IT in different institutions. i know i was intentionally trying to push my stay in USA.

when i go for my H1b interview (scheduled in Nov) what question i can expect in regarding to this scenario and what would a best and reasonable response so that my visa interview will be a success.

Your advise is much appreciated.