in Engineering Entrance Exam MH CET 2016 ,WAS THE SYLLABUS BASED ON only HSC SYLLABUS OR BOTH CLASS 11 AND 12?

Yeah the syllabus is based on both Class 11 and Class 12. You should study both the books during MHT-CET. 

Practise as much problems as you can and thats it.

Hope it helps.

Thanks

@ xavier 
in the MHT CET syllabus u have to study both the 11^th as well as 12^th class books , 
as MHT CET contains each and every syllabus . 
for more details u can look into the askiitian blogs also . 
and this 11^th and 12^th is with respect to the state board textbook , not for cbse , so, u need to study the state board textbook . 

ALL THE BEST ..