Essam,
In general, 'practice exams' for SAP certifications are only provided by private companies, and these documents are often copywrited. You will not find any copywrited documents posted in SCN, although there occasionally are links to copywrited documents.
Below is a link to the official SAP sample questions for this exam. This is not a practice exam.
Beyond this, you can perform searches in SCN (the small box in the upper right hand corner of this page), or you can use one of the large internet search engines to find off-site links and documents that may meet your requirements.
https://training.sap.com/uploads/C_TSCM62_65_sample_questions.pdf
Best Regards,
DB49