The difficulty level of GUJCET exam is moderate.I will tell you subject wise for PCM.

Physics : Easy. If you have done all the MCQs of textbook,gone through all concepts and solved all mcqs of “Sva-adhyayan pothi of Gujarat board” then you can get 40/40.

Chemistry : Moderate to easy. Same things mentioned above you have to solve in chemistry. Here you can also get 40/40 if you cover all things mentioned above and your all concepts are crystal clear.

Maths : Hard. In my opinion maths is quite tougher than other parts of GUJCET. Here you will get a glimpse of JEE MAIN questions, similar questions but in 1 marks so time is very important parameter for MATHS . To get good marks in maths you have to solve whole B.S.SHAH + JEE main questions(if time permits) + Textbook sums. You can get >35 marks if you manage time during exam.

So I am repeating again don't underestimate maths,time management will be the most important for maths.

This is general scenario of GUJCET but may be change in future .

Hope you get the answer

All the best!