Greetings,
I am a student pursuing my bachelors degree in computer science and hence I can completely relate to the scenario you need to prevent as I have been using tricks to get through any MCQ exams. There are many ways by which your students can cheat on the exam you are trying to conduct on Google Forms. I can provide you with all these different ways and possible solutions to these ways. I can also advice you on other platforms on which you can conduct your tests to make it more reliable and cheat-proof. Also I have been interested in cyber security, and if you need a professional level report on security of exams being conducted using your method, I can provide you with that too. I think I would be the suitable candidate for this work as I too am a student and hence can think with the same mindset while testing for ways to cheat on the test.
Thank You