Me and my son went through Essentials last year, he was in 5th grade also. We struggled through it because it's a tough program and in my opinion, there isn't a need for any other grammar when doing Essentials. This is a three year program, not 24 weeks, so he will get all the grammar he needs over the next 3 years if you stick with it. There is only so much grammar you can learn and then they only need to do review work. I have found with my kids, that the more I have them do, the less they retain. So I would only do Essentials and nothing else. When we weren't in class, he did charts, the task sheet and the editing page. The first year of Essentials is to be spent memorizing those charts more than anything else. It was more than enough grammar for us.