Im planning to write my Instructor class 4 written. any tips how can i pass the exam. my average is a bout 75% in the . Practice exams.

You might start with this:

http://www.tc.gc.ca/CivilAviation/publi ... 0/menu.htm

Read the first 62 pages of the FIG:

1) learning factors - what are they, how to apply them
2) questioning techniques, and good and bad questions
3) knowledge of CAR 421 (rec, ppl, night experience requirements)
4) a little knowledge of car 405/425/406/426: flight instruction
and FTU's.

P.S. Shouldn't your class 1 be helping you out with this?!

Thanks i was just seeking for more information .. i did most of my studying from the flight instructor guide. i was doing a self study.

Self Study. You'll know when you're ready.
I used the . and the Flight Instructor guide.
Know the Theory and the Teaching techniques and what to do with different students. Basic stuff.. Easiest written I ever did. Similar to the PPL