You need 3 tools: 1. Get a good book. Mala Gupta's OCA Java SE 8 Programmer I Certification Guide: Mala Gupta: 9781617293252: Amazon.com: Books is a good one. Cay S. read more
If you are a visual learner, highlight texts in multiple colors. Here is my “battle-tested” learning method: I try to construct full sentences from the highlights. That is, a shortened version of the book – which contains only the most important points. read more