Welcome to the Bunnings Workshop community @jtan93. It's a pleasure to have you join us, and many thanks for your question about repairing concrete.
Given the number of areas that need repairing, using a repair mortar and patching them individually might be tedious. I'd suggest instead using a floor leveller over the entire area. You can use a placer rake to spread the leveller out. Not only will this be less time-consuming, but you'll end up with a better finish.