IDES is best way to get practice. As you told that 3+ years of experience in procurement process also you done the MM course.
With this experience you can practice in IDES with your working company structure for better practice.
Like this you can build your own set of configuration for multiple business process. Keep in touch with SCN.
Sure you will get confidence within you to attend the interview and get the job.
Regards,
Prabhakaran M