preparation for group 1 or 2 or both in 100 days??

First of all we need to relax & overcome the state of sorrow & shock. Spend some days with your family/friends just to forget the bad past. This will help you for a new Come Back !!!

When you feel ( Feeling jaldi aani chahiye, as jada time nhi he N17 exam ke liye :p :p haha) like you have won the battle over bad effect of result, then u note down what mistakes (as u hv mentioned above) you feel you hv made, for each subject wise. It wud be grt if u can get ur answer sheet from ICAI and compare ur answer with some standard answer sheet of Rankers/Strong students which are readily available over web.

Do a GAP Analysis

Identify Oppurtunities for Improvements (OFIs) for each subject. May be theory, practical conceptual understanding

Prepare a strong Study Plan subject wise. (Strictly Adhere to it)

Execute/Implement OFIs

Incorporate Frequent Revision Schedules as u approach towards syllabus completion

You may prepare for Group 2 as you know it is so much dynmic in terms of Amendments in Laws. And "100 days" is just & sufficient to cover up single group with at least 3 time revision.

Thanks ! ! !

Note : Personal Opinions & Past Experience