Practicing between your weekly yoga classes will help you improve your poses (asanas) more quickly, and will give you greater health benefits. Students have told me that part of the reason they don't practice is that they don't know what to practice, or they think they'll do the poses wrong.
Practicing between your yoga classes becomes more essential as you become more experienced and take higher level classes. You'll find it much harder to progress in the more difficult, complicated yoga asanas unless you put in your own work between classes. If you're having trouble in certain asanas and just can't figure them out withing your own practice, you're welcome to come in early before classes to get help. I'm usually at the studio 1/2 hour before class starts. Some students are finding it's helpful to take more than one class a week. I'm also available for private lessons if you'd like more focused attention on some aspect of your yoga practice. But my guidance is only worth a little if you don't follow up with your own work.
Here's a link to a series of practice sequences on the IYNAUS (Iyengar Yoga National Association of the U.S.) website. Sequences for practice
I've posted this link before in newsletters, but it's always good to check again! There are 4 general sequences for Level 1 students, and 4 sequences for Level 2 and higher students.