Did someone got through Peace Walker DEMO?

I'm kinda stuck, I think. I'm on the stage I you have to beat a tank, so yeah I beat it cooperatively and in single mode with a time between 2:05 to 2:10 I got a B, how should I beat in less time? 'cause it looks like you have to beat them all with an A to unlock the fourth stage, is that right?

there is no 4th stage. demo ends there. here is a link to an online walkthrough/guide if you need any help http://guides.ign.com/guides/965242/

Sorry but where can you get the demo :P Is it on the EU PSN store?B-o-u-n-c-e

Download it from here.

http://www.pspdemocenter.com/list.php?c=pcdown

there is no 4th stage. demo ends there. here is a link to an online walkthrough/guide if you need any help http://guides.ign.com/guides/965242/

boybrushdred