Final

Not very sure what you mean by longest, but certainly it is a very technical paper, which would require you to write the exact points in order to score good marks in the exam. 

In that case, it is not so voluminous as compared to Direct Tax Law, which is more like an ocean.

Since you have the latest material in hand and have decided to devote two hours daily, this sounds good to get started. As you will be reading from the material for the first time, just do a fast reading to familarize yourself of the topics that you are likely to cover. During first reading itself, mark down the topics which was easy to finish reading and those which was consuming more time, along with the time required you also note down, which topics you found it easy and which was tough.

The biggest challenge in a paper like ISCA is understanding the quesion thoroughly and able to write relevant points. What happens many a times is, we are bound to get too confused in the examination hall and end up writing the wrong answer. For example when the question is asked about What are the features of MIS ? In our excitement or due to confusion we if end up writing answer on pre-requisites of MIS. Then, in that case how can we expect the examiner to award marks. Hence, it is highly important to make it an habbit to practice questions along with the answer and make an effort to recall whether you are able to answer the correct solution for the question. 

Keep practising and change the strategy midway, if something is not going as per your plan. In life to achieve success, everyone have their own ways and methods. Wish you best of luck.

That's where your smartness comes into play. Everyone has only 24 hours in a day with them, so if some one is able to utilise the time effectively, you must feel motivated to try to give your best. In life to achieve something you need to give up something. This may be surfing facebook for long duration, or being on whatsup or having a stretched phone talk, or watching tv - may be an IPL match etc. There is something of this everyone does it, so just to see that the results are in our favour we need to sacrifice some of this entertainment. It is up to you how focused and confident you are, it is all within us, so believe in thinking "yes I can". Good luck. 

GET Manish Valechha ISCA TextBook (Memory Based Edition). It is the best selling text book for  ISCA. Very well written with examples, diagrams, memory codes (refer Study Material if you have spare time but in my view SM is not actually required). Use M. Valechha with PM more than enough.

manish valecha is more than sufficient.