Hello Tanya

It is difficult to secure rank under 5000 within 40 days of preparation.

It also depends upon your previous preparation and concepts clearity and how much practice you did .

Because if you start with beginning ( high level questions) than it will be difficult to grasp those concepts and that type of sharpening in just 40 days.

All you can do is practice some good level questions from good books.and solve master package of any good institute and solve previous year paper with proper sitting.

So good luck.