As others say, it's probably best for everyone if you can find a tutor. Having both of them work together with a tutor may help, but you need to be sure that the tutor can provide appropriate correction if they start to reinforce thoughts that are wrong.

E.g.: I remember in 6th grade or so studying together with a kid who was quite a bit slower than me. I didn't understand the subject as well as I thought I did and we ended up "learning" some things that were wrong. Situations like that will arise and a tutor would have more experience with how to straighten it out.

You don't want to get in a situation where it's 2 against 1 and they feel that the answer is arbitrary.

HTH. Luck!

Cheers,
Scott.