We love all of Saxon Math! I used it when I was in school and now I am using it for my kid's math classes. The way they can pick right up with it and the way the curriculum reviews sets it apart from other math curriculum we have used in the past. I would highly recommend it to anyone for any grade level.
gives good steady progress. increases speed in the basics with timed tests. problems with using it in being from the UK is that measurements, coins, temperatures etc are different. however, you can just adapt this and make it suitable.
We switched from Singapore to Saxon and I cannot say enough good things about Saxon. I just could not find a good way to teach Singapore in a way my 8 year old would understand. Now, my daughter is technically in 2nd grade, but I bought the Level 3 and it's a great fit. If you're not sure, there are placement exams to find out where your child should start. I love that the entire lesson is scripted. It's also VERY repetitious, but that is good for my daughter to make sure she remembers the basics even while we're learning new skills. Now we kind of modify it (in part because I have 2 other children to teach, and also because it is a VERY long math lesson), we don't always do EVERYTHING every day, and sometimes we only do 2 of the 3 worksheets they recommend(she has mastered basic addition and subtraction so we only do that occasionally for review rather than every day). So you can still modify it for your student's attention span so it's not quite so much work in one day. We love it!