Take a closer look at Elevate.
I'm not the only one who likes Elevate. Apple and the App Store selected Elevate as the best iPhone app of 2014. I have been using Elevate multiple times weekly and my arithmetic, writing, comprehension, speaking and listening skills are all improving. It's a beautifully designed application and it keeps you motivated by providing with you with attainable goals and progress charts.
Elevate also takes advantage of one the latest additions to the iOS software and gives you a widget with a summary of your current statistics in regard to each of the 5 targeted categories. Install this app, give it a run and see if your learning ability is elevated in the process. It's free in the App Store.