| While a 29 is good and can get you into good schools, it is by no means uncommonly good. In other words, people are not going to throw money at you, especially a full ride.
I got a 29 the first time I took the ACT. It's a good score, but I thought I could do better. I got a review book and dedicated some time to going through it and taking practice tests. I ended up with a 33. I still think I could have done better, but there was really no reason to take it again.
I ended up with scholarship offers maxing out on there allowable merit aid. That combined with another decent corporate scholarship and one from my high school covered full tuition.
Honestly, test scores won't lead to a full ride, unless at:
1) a not so good school
- or -
2) a good private school that basically gives all accepted student a huge amount of money. I think Swarthmore subsidizes all students tuition cost or something. I know some are out there, but I'm not positive about that example.
My advice is to study to get your score up, because 31-32+ is where significant $ start to be given out. Also, apply to places you want to attend, not only to places where you think you can get a full ride. They are difficult to come by and usually come from places you don;t exactly have at the top of your choice list. | 
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