:- weightage of diff. subject depending on the conducting IIT. So, it can vary year to 

          year. from this year GATE is including Aptitude secton which will carry 15 marks.so u can not neglect this also.But in general as follows:-

          Engg. Mathematics -15-20%

          Networks- 12-18 %

          Electronic devices and analog circuits- 15 %

          Digital circuits- 15-20%

          Contol- 5- 15%

          Signal system &communication-  15-25 %

          Electromagnetics- 10-12%