You don’t need any study

You don’t need any study guide for the first paper. ..Just read Tony Arnold …that is more than sufficient
Just to give you an idea about participant workshop and study notes

participant workshop usually contains all the areas covered in exam
the guide is usually meant to be used in a class room…not for self study…

I have not attended any class room but still found these guide books quite worthy (for DSP & ECO)..

Study notes are written more like books and quite interesting to read but they don’t cover all the areas asked in the exam.

I also need to know!

i am started studying from basics of supply chain management reprints and i am kind of lost!! i am not sure if i am doing the right thing, my exam is in one month!

One month of preparation

One month of preparation should be sufficient to clear BSCM
Reprint is good but I would suggest you to go through Tony Arnold..you can skip the chapter on product & process design..rest are necessary..

best of luck for your exam