Best coaching centre is a highly subjective thing. I would personally ALLEN institute as the teachers are highly knowledgeable and helpful. Moreover, the test series of ALLEN is quite good and attended by a huge number of students, which helps you to judge quite fairly where you stand in the competition.

Moreover, a good institute can be judged from the number of students studying there and in this regard, ALLEN is the biggest out there.

You should aim to cover as much syllabus as you can quickly and cover as much material as you can in a given period of time as it will help you to cope with the high pressure exam environment.

Hope I have answered your question. All the best!