Some resources to look
1. To decide if you should skim:
http://www.howtolearn.com/2013/02/skimming-and-scanning-two-important-strategies-for-speeding-up-your-reading/
2. Skimming + Scanning in sheet:
http://www.butte.edu/departments/cas/tipsheets/readingstrategies/skimming_scanning.html