There are a number of things an actor can do to prep for rehearsals. Here are a few tips to help you get the most out of your rehearsal time!
Read the Play - Read the entire script, front to end. Don't focus on your character or lines, just get a feel for the overall play.
Prepare your Script - While it's easy these days to try and work with a script in digital form, it's best if you print up a copy. This way, you can take notes during each rehearsal. Take the time to run a highlighter over your dialogue lines - but don't highlight the stage directions. They're apt to be modified a bit to fit the venue you'll be in. Post-it tabs are a great tool to mark the beginning of each of your scenes so they're quick and easy to find.
Script Analysis - Think about building your character. This is a process you'll work with your director on, but the more ideas you bring to the rehearsals, the better. Understanding your character's motivations is important to bring the play to life.
Look at the Production Schedule - Make sure your personal agenda is up to date with all your meetings and commitments. Check to ensure you can make each rehearsal. If you see a scheduling problem, tell the director right away. Give your team time to change things around so everyone is present when you're needed.
Be early - Rehearsal time is valuable, not just for you but also for all the people working on the project. Come 10 minutes early to get your hello's out of the way so your rehearsal time is used for rehearsing, not catching up with your fellow actors.
Remove all distractions - Turn off you phone and other devices. Forget about the problem at work, or in your personal life. You are no longer you once rehearsals begin. Give yourself a little time to warm up before each rehearsal, too. It will help to focus your mind on your role.
Bring your agenda - Rehearsal scheduling can change; be ready to discuss when you're available!
Clothing - Wear loose and comfortable clothing, and shoes that don't restrict your movement.
Bring your script and analysis - It should seem obvious, but it's easy to forget your script if you head out early in the day. Remember to bring your analysis, too. As you work through the scenes, you can have your analysis close at hand so you can easily reference it.
Pencils and erasers - Expect changes. Don't bother using a pen; you'll end up with a mess on your script. Pencils are easier!
Be ready to have fun and be open to all ideas about your character. You'll get the most out of your rehearsals!