The phrase "to make sure something gets done" means taking necessary actions or ensuring that a task or activity is completed successfully. Full definition
The nominal accounting fee will probably be well worth it to make sure you get this done correctly. (money.stackexchange.com)
It can take up to 2 weeks to receive your completion certificate, so make sure you get it done at least 2 weeks before you must hand in your certificate. (drive-safely.net)