Dear Richa,
You need not be tensed for your 11th grade (CBSE) music exam. As you said your music exam will consist of two parts:
THOREY EXAM (15 MARKS)
Theory is a written test which involves instruments, notes, history of music, meanings, etc. Start preparing 2 months before your exams by downloading practice papers from the Internet and have your teacher assess them.
PRACTICAL EXAM (15 MARKS)
Practical generally involves scales, pieces and selected exercises. Adhering to its name, practice is required to ace such an exam. Practice for at least 45 minutes every day for honest practice to yield good results.
Wishing you all the best.
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