Is the level of mock test comparable to actual bits exam or actual is more difficult
It cannot be said that the exam will be easier or more difficult than the Mocks. The exam is easier sometimes. But mostly, you should consider that your marks will go down. Around 20-30 lesser than the mock tests. So if you need more preparation to bring up your score from 350s to 380s, you must go for it. Do not stop your studies based on the mock tests.
The key thing here is not only to give many mocks but also analysing each mock before proceeding to the next one