This is exactly what you are looking for. Good luck.
I'm in the same state, got many calls from Google interviewers. I am a little slow in coding hard problems on codeforces. Another couple of months n I shd be good
In 1 & 2, are free where you are paired with another candidate who's also preparing for interviews. But you are not sure if it's simulating "real" interviews.
3 is paid and quite close to real interview, but costs can add up.
4 I participated in this and highly recommend. But probably you are not looking for this as this is a full blown interview bootcamp.