Amber Marie there is no other way to retrieve your passcode. You will have to reset your tablet.
"Performing a factory reset from settings
Follow the detailed instructions below on how to completely reset your RCA Android 4.1 tablet.
1. With your tablet turned off, press and hold the volume up (+) button. While holding the volume up (+) button, press the tablet’s power button until you see the RCA logo with Nipper and Chipper on the screen. After a few seconds, the screen will change and you will see the Android bot on his back with a caution symbol above him.
2. Now you are going to press and hold the tablet’s power button, and without releasing the power button press down on the volume up (+) button. You should then see the screen below.
3. Use the tablet’s volume up (+) and down (+) keys to navigate to and select the "wipe data/factory reset" option. To select this option, press the power button.
4. The tablet is going to ask you to confirm your selection. Use the tablet volume up (+) and down (-) keys to navigate to and select "Yes – delete all user data." Once again, use the power button to select this option.
5. At the bottom of the next screen, you will see "Data wipe complete." Press the power button to restart the system.
6. The system will begin to reboot and once again display the RCA logo with Nipper and Chipper. The next "Welcome" screen will prompt you to select your language of choice. Scroll through the options using your finger and press start when finished. "