Hello Bharath Kumar S  ,

Now this is the vital time for Advanced. after JEE mains only thing to be focussed for Advanced is Problem solving and for that not only solving problems should be focussed on but alon with that you should also focus on improving and grooming problem solving skills.

Now if i talk about books then as you asked about Akash's Study material, I cant actually comment on its content but I have gone through and solved FIITJEE, Narayana, Allen, Resonance and Bansal's study materials and almost each one of them were fine and stood firm at its own place. So, in my opinion Akash's study materila would be fine and apt as they are prepared by the experts.

So, you can solve from that.

Besides all:

You must appear for Advanced Test series.

And as of books:

You can refer the following for problem solving in maths:

1) Arihant series: Sk Goyal and Amit M Agarwal books: in those books directly go for excercise questions and solve them throughly. They are very much compentent questions of JEE Advanced.

2) For physics : Try to visualize things and besides revising HC Verma, you should focus on your coaching's materials.

3) for chemistry again follow the same coaching materials and practice hard!

Try to solve as much questions as you can!!

Hope that helps!