The following titles are on reserve at the library service desk for organic chemistry. Every chapter in Organic Chemistry I&II has practice problems. The Preparing for Your ACS Examination in Organic Chemistry study guide also has online versions. Check these books out with your Gull Card for 2-hour use within the GAC. Scanners are available on the first floor.
You can also use non-chemistry tools for rough mockups, such as Microsoft Word or Adobe Illustrator. There are other more advanced drawing software online, often requiring a paid license.