During those 20 hours between the ISCA exam and DT exam, you have minimum 1500 pages to go through. That means, you need to revise at a pace of 75 pages per hour to complete the whole syllabus of Direct Taxes. This task seems a little far-fetched. What seems a more realistic ask, revising 10 pages per hour with proper concentration. In the one-day revision book, we have incorporated all the provisions of the Act along with examples and case laws. So, if you deeply revise all 180 pages of the book, you will easily revise the syllabus within the proper timeframe.