I think MyPat and Embibe are both good for getting whole syllabus centric tests. There are always some loopholes in all test series, some give good Physics and Chemistry, so just give fair mathematics, while some the other way round. So I would suggest you to go with either of the above.
IMO, MyPat is actually better as the level of papers is really good, as I got to know. It was actually kinda open at the time I was there in my class XII. I felt the level of paper to be really nice, especially for the MAINS one. It actually tests your skills in the limited time frame.
All the best!