It's probably not the level you need or Ord. exams, but I think Vander Zee's Christ, Baptism and the Lord's Supper: Recovering the Sacraments for Evangelical Worship is fantastic.
For those interested, I highly recommend Vander Zee's book Christ, Baptism and the Lord's Supper: Recovering the Sacraments for Evangelical Worship. I think it would be helpful even to Zwinglians and Credobaptists.
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Christ, Baptism and the Lord's Supper: Recovering the Sacraments for Evangelical Worship
Given for You: Reclaiming Calvin's Doctrine of the Lord's Supper
The Lord's Supper as a Means of Grace: More Than a Memory
The Lord's Supper in the Reformed Tradition
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Some recommendations, as promised.
I highly recommend Christ, Baptism and the Lord's Supper: Recovering the Sacraments for Evangelical Worship by Leonard J. Vander Zee. It's more pastoral than heavy duty theological, but definitely worth reading.
Read the treatments of the Lord's Supper in Reformed Systematic Theologies. Calvin's Institutes is a must, I think, but also Bavinck. The part on communion is in volume 4, I believe. If you don't have access in Bavinck (a situation you should resolve) then Berkhoff would do.
Given for You: Reclaiming Calvin's Doctrine of the Lord's Supper by Keith A. Mathison is supposed to be very good.
If you want a non-Zwinglian perspective from a Baptist, check out Richard C. Barcellos' The Lord's Supper as a Means of Grace: More Than a Memory
If you are up for technical theology, I'd recommend The Lord's Supper in the Reformed Tradition by John Riggs.
RC Sproul's What is The Lord's Supper? in his Critical Questions theory is currently free on Kindle. It won't answer all of your questions, but the price is right.