sir thisregarding my son who is very lazy i writing he knows all but does not write what should i do
All I can do is give you some links to some excellent study skills websites. The rest is up to him.
http://www.studygs.net/
http://www.how-to-study.com/
http://www.adprima.com/studyout.htm
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http://www.d.umn.edu/kmc/student/loon/acad/strat/
Good luck. =)