There are a number of mobile apps and websites on the market that are specifically designed for practicing for the Chef's License Theory Exam. These resources usually provide chef theory question banks and practice exams to help candidates familiarize themselves with exam questions and improve their problem solving skills.

The following are some of the platforms that may be applicable:

1. Official Chef Exam website: some regions may have official Chef License Exam websites or apps that provide relevant theory exam practice question banks.

2. Exam training organization websites or apps: Some professional exam training organizations may provide online practice question banks and mock exams for the Chef's Certificate theory exam.

3. Online education platforms: Some well-known online education platforms may provide relevant practice question banks for the Chef's License Theory Exam, and candidates can find relevant resources on them.

Before practicing with any apps or websites, it is recommended to confirm their legitimacy and authority to ensure that what is being studied meets the official exam requirements.