Found this non-profit web site where 10 grains of rice is donated to people in need for every answer you get right. It's a great exercise for those of us who are still learning the English language! I needed help with almost every question starting from level 12 and I learned many new words!

It's kind of additive and I've ~earned 530 grains of rice so far :D

They have exercises in other categories such as chemistry and maths too!

http://www.freerice.com/

The link has also been added to my growing list of writing resources :D