On Wednesday, Amazon announced it was pushing to get its Kindle e-readers and tablet computers into the education sector, a move that will bring it into even stiffer competition with Apple, which has seen some successes in getting schools to look to its iPad as an educational tool. Amazon has been testing Kindles in kindergarten through 12th grade programs across the United States, and the company believes its services make the Kindle an ideal match for educators looking to manage content across devices.