Gaining an SLC is fairly simple if you are already a competent sailor. Basically, it is a suite of online bareboat charter knowledge courses and tests followed by a 1 day on the water assessment of your skills and knowledge. If the sailor feels they are already knowledgable on the material, they can jump to the tests.
Follow the exact instructions on this page to gain an SLC sailing License
The SLC Exam is a stand alone exam and is in addition to the requirement to pass the online courses. It is free to take and must be passed every 3 years to ensure the sailor has maintained critical knowledge. Most sailors will not pass the SLC exam without having taken the courses first.