Embedded in a huge post here is a list of A -Class guides. I have blatantly copied the links: 

aclass002.pdf – Harken – A Class – 2015 Cascade mainsheet system
aclass003.pdf – Tips on Sailing the A Class cat
aclass004.pdf – Landenberger Tuning Tips – Mast Setup
aclass005.pdf – A class tuning guide v3 Greg Goodall
aclass006.pdf – Tying Fibrefoam battens
aclass007.docx – Brewin Sail Tuning, Care and Rigging
aclass008.pdf – How sails work by Paul Bogataj
aclass009.pdf – Nacra A2 A class catamaran Rigging and Tuning guide
aclass010.pdf – Very general info
aclass011.pdf – Tuning your DNA