(marketscreener.com) Engages with ProLearning Source to Target 6.2 Million Students in K-12 Across California ...http://www.marketscreener.com/news/ECS-Learning-Systems-Expands-Award-Winning-PREPWORKS-Line-of-Adaptive-Learning-Solutions-into-Cali--28153012/?utm_medium=RSS&utm_content=20190312