n2739178
there's a good app on android market called 'GMAT Review' by Watercress/Waterfall something... very good actually for revising content 'on the road'
I searched on the android market but didn't find the app you recommended. I own Motorola Milestone (currently rooted and running CM6 froyo)
As far as, GMATClub's app for Android is concerned, when I bought my Android phone (got on quarter price from my employer) instead of iPhone (couldn't afford), I asked "bb" it would be great if we had an app for Android Phones. And according to him, working on iPhone's apps is already consuming a lot of walker's time and it won't be possible in near future. And also, it is a totally different platform and you need a developer for that as well. So, it will take time to develop a good quality app (quality is what we need).
Just my 2 cents