Yes, my kids were/are home educated before going to secondary school - there are a few of us here
If he's really not getting anything positive from school at the moment, then why not go for it?
Not really sure what sort of tips you want ... you will almost definitely be able to find other HEors in your area for support and social activities. You can concentrate on 11+ work for the next few months, and then work on whatever your son is interested in for the rest of y6. Or do a mixture of things now - that's the nice thing about HE, you can do what you want
Your son sounds very motivated and that will probably make for a very pleasant 18 months before he goes to secondary school. (Or you might enjoy HE so much he doesn't go!)
My children have slotted into school life without a hitch, and have not encountered any problem school due to being home educated.