lovemythree,
You've already received such good advice!

At HOD, we recommend beginning Rod and Staff English 2 when your child is in the third grade. We typically use Rod and Staff one year behind the child's grade level due to the rigor of Rod and Staff. It is truly a wonderful English program, but it can get to be too much if you get to the upper levels too soon.

At HOD, we plan for student to complete English 6 by the end of grade 8 and to do English 7 and 8 throughout high school.

When Rod and Staff is combined with all of the additional writing, literature study, and CM-style langauge arts skills in our guides; this plan provides a well-balanced language arts program.
As far as math goes, it will make a huge difference if you use the plans in the HOD guide to help you as you teach through the early years of Singapore math. If your child is struggling, I would definitely be sure to have the Bigger guide to do the hands-on math lessons. I think it is a great idea to back your child up to the beginning of 2A and begin again, following the plans in the Bigger Hearts guide.
As far as drilling the facts go, I would set that aside for right now. Singapore actually teaches kiddos to internalize the facts without drill as you progress through the years. Drilling can really make a child feel stressed. We plan for kiddos to be using manipulatives for their math lessons at least through 2B. It is a needed component.

So, allow your little honey to use his fingers or any other manipulative that helps him get the answer.

Mental math is only introduced in 2A/2B, meaning it is not intended to be mastered at this level. It takes years to get the mental math portion down and is a gradual progression.
If your child is sincerely struggling with understanding multiplication be sure to let him count the pictures provided right within the workbook. You could also consider adding the Skip Count Kids CD (Bible version) to help him learn to skip count. This is not something that is a part of the Singapore program, but it is something we have used with success with three of our kiddos.

Just have your child sing only the skip count song needed for the multiplication facts he's working with for that day. So, you could have him listen to the Skip Count Song for the 2's and 3's only right now. Have him follow along with the words. This will help, without drilling.
We did too much switching with my oldest son in math, and I would recommend trying to avoid that as much as possible. I realize Singapore math may not be the fit for every child, but I would highly recommend giving it every opportunity to succeed before jumping ship too early.
Blessings,
Carrie