As other has pointed out there may be some areas in which you can squeeze out a few more dollars. Lights is what I would look at depending on the size of your rental. But I just want to tell you good job with your plan of having paid by July. I think $600 a month for 2 people on groceries is pretty good. That is about what my wife and I spend on the two of us. And food can be a good way to enjoy some of the little things.

Any way good job with the budget you outlined, good luck with your endeavor. There may be a few more dollars to squeeze but you already got most of it and this something to recognize and celebrate. You and your wife can achieve this.