What is the difference between a "sleeve" and a Roux-en-y?

I have just gone through 7 weeks of my options class (mandatory 6 month classes before surgery). and I am not sure what the difference is between the two surgeries. I am 40 yrs old and 5'2" and weigh 255 pounds. I am told that I can lose 100 pounds with the surgery. Won't that still leave me overweight? I am worried about not being able to keep the pre-op diet and if I just fail all together. I only have 1 friend and shes skinny, so she doesnt understand what I am going through. Please help.

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