better for self study f8 or f7 ??????????

Hi,
I am doing F6 this June and have registered with a tuition center.I would like to do a paper self study (with the support of Opentuition) Which is better for it F7 or F8?
Also consider the fact that i have never taken a paper based exam.

My tuition providers are also pursuing me for doing F9. What do you think??