Amal
Go through the questions at the end of each chapter. Understand the concept as that is the key for the exam. And for your question here are bit of sample questions searched on google (rest I hope you can search by yourself).
https://training.sap.com/uploads/C_TSCM42_65_sample_questions.pdf
If this answers your question follow How to use SCN search | SCN
Regards
Rahul