App recommendations please!!

[scrappydappydoo]

We're about to disappear off camping for a couple of weeks - we'll have access to electricity but no internet access. Are there any good android apps that I can download for my DC (just finished yr 3 and yr 1). I'm looking for something like educationcity with lots of different stuff across the curriculum and can track progress. I've already got a couple of maths apps for times tables and adding and subtracting but looking for something a bit more?
(will also do all the usual incorporating learning into everyday life but wanted something more structured like they would encounter at school and dc love anything on a tablet)