One of the best websites with a fully (and cost free) GO Curriculum is online again… its www.321go.org .
The Website is hosted and maintained in Netherlands, but available in six languages (incl. ENG). – A good GO friend of mine started to play Go in November 2013, and with the help of 321go.org he made it till May 2014 to 7kyu (on KGS). Its a very worthfully source to learn the basics and to play successfully up to 10kyu minimum.
The fully GO Course has more than 3,700 exercises, organized well in 6 main chapters… registration is cost free. You can do the excercises as often as you like, and it has a controlling tool (with To-Doe List) you know which ones you should repeat till you have “0 faults” (see my own statistics in last screenshot).
The exercises are inter-active, e.g. clicking the correct moves or as multiple choice… for double digit kyus (DDKs) its an excellent tool to learn all basics, e.g. counting, (Double) Atari, creating living groups, understanding the basics of “life and death”, KO, Seki, Ladder, Net, conneting and cuttting, catching, openings, josekis, tesujis etc. ….