Chemistry Advanced Level

My app is on playstore but you can not access the book content until you buy the app. it's quite expensive. the few hours you will spend with me while writing my book, might be most well spent moments for you this year. The app link is shared bellow and everything is published right now in the app. https://play.google.com/store/apps/details?id=com.stockmarket.android&hl=en&gl=US