Hi,
These are the books that we like and are using for few yrs now and my DD is 9 yrs and in 4th grade.
Language arts -First language lessons, book is very good.It doesn't require any writing for level 2.
Writing with ease - My Kid just listens to the stories and answer the questions orally,We don't use the workbook/handwriting part at the end of the book.
For reading comprehension -Reading Detective from Critical thinking and Evan moor daily reading comprehension.
Math
Singapore Math Standard Edition -We use both textbook and workbook.There are loads of Singapore Math books apart from text book and workbook.And they are good supplements too.Personally, I like Singapore Math because I don't have to break my head to think what will come next ,everything is grade wise ,with simple explanation.In public school we get one page of homework daily (either Math or English)and with that I don't whether they are covering every concept.
This is the third yr we are using singapore math.When we started I bought Math mammoth to compare and see how it is ,but I didnt like math mammoth.
You can teach them when they are with you and give them supplements to work independently when they are not.For all the books sample pages are available in Rainbow resource website. I also use commomcoresheets website for free math worksheets and they are awesome.
Pick and choose what works for you and your kids.I would first work on the subject or concept that I think they are finding it difficult ,since time is limited.
All the best.