these are my humble suggestions for u out of my experience.
Start studying Cost and FM from now itself.
For costing follow Material, Jain and Narang book, Practice Manual and have a planned study bcause to vast portions.
See that u study each and every chapter by understanding the concepts give importance to theory too.
and another important point is costing s for only 50 marks, keep it in mind that u have FM for another 50 marks.
give importance for FM too. Fm portions are few and carry equal weightage.
For FM go for Material, Practice Manual, and Padhukas and as much as u can covering our syllabus.
In Fm they ask for Reverse working sums so go by concepts, See that U are strong in FM concepts and practice well.
Practice well. And Spend time for Fm also. Sometimes Fm s easy and can score well.
If u have doubts clear it with ur teacher and not by your own.
In all subjects they are covering each and every concepts so be alert and dont leave anything.
If ur r going to write only first group, if u have a planned, conceptual study u can easily get through.
Dont use Scanner while studying, it is only to check that how much u know the concepts which are asked in previous exams and that s only while revision.
Concentrate equally on other subjects especially Law, ethics and commn. 