How i got 85% in 12 isc commerce ..??
I would suggest you to follow below provided preparation tips -
Focus more on accountancy as this is one of the most scoring subject.
Avoid reading all content as it is better to focus on important questions.
Practice previous years and sample papers properly.
See question paper after studied every chapter (it is very important).
Lastly, practice as much as you can because this is the only way possible to crack the exam with flying colours.
Hope this helps!!!