I would say you should use the codetantra app when you are using it on android phone. You are not being able to use it on chrome since its not getting the permissions for remotely proctored your device.

You may visit the codetantra website to learn more:

https://iiitdmkl.codetantra.com/privacy-policy.jsp

Now VITEEE isn't tough but you need to have a moderate preparation in order to secure a good rank. You should strengthen you subjects and don't mix this up with the JEE preparation as it is much much easier than the JEE.

I hope the answer helps. All the very best for your future endeavors!