You can still do it.....but u hv to plan ur studies......Following points you should take care of it :
1. Firstly, Believe in yourself
2. Switch off ur mobile phone
3. Avoid unnecessary internet browsing and roaming with freinds.
4. And most importantly, First complete preparing one group and than go for the other group subjects.......as the time is less.......if before exam (say atleast 30 to 45 days before) u feel that u will not be able to complete entire course than at that time you can go for one group......
5. Lastly.....do all the amendments and all the latest cases especially supreme court cases nicely for Direct and Indirect Tax......
Best of Luck.
Warm Regards,
Akash