Need Help with Contractor's Estimate

[Chris Marte]

First time investor here. A contractor has walked-through a property I'm interested in and sent over his estimate for rehab (below - includes labor & material). Not really sure where to begin when reviewing the estimate as I'm not familiar with rehab projects.

Looking for advice from those who have experience with rehabs. Are there some cheaper options my contractor may not be considering? ie. laminate flooring, etc. What questions should I ask?