Samir,

Almost every engineering examination follows the 11 & 12th class syllabus as prescribed by CBSE and every exam follows the syllabus from ncrt text book. 

No need to worry about comedk syllabus as it will be strictly in accordance with cbse class 11 and class 12 syllabus may be 1/2 question be out of syllabus but it won't make a huge difference. 

I had myself given the comedk exam last year amd I can assure you it will only consists of question from the topic of 11&12th class. 

Comedk is easy in comparison to other engineering exams like JEE AND BITSAT. 

there is no negative marking and I think you can easily crack it with good marks. All you need is just the basic knowledge of PCM (11 AND 12TH) and speed. You will be provided computer calculator for calculations.  Comedk is easy. Isn't it?  Calculator for calculations making the work easy. 

If you still want a detailed syllabus follow the link... 

https://comedk.net/syllabus-2019/

And for practicing mock papers follow the link

https://www.digialm.com//OnlineAssessment/index.html?1022@@M27