Certificate programs are designed to provide training that matches current industry standards. As those standards change (usually yearly), program requirements change. For that reason, certificates should be completed in one year, if possible.
You are allowed to miss 10% of total class time for emergencies. As soon as you know that you will miss a class, contact your instructor to get assignments. Consult Blackboard and the course syllabus for specific rules. If you are going to miss a scheduled exam, you must take the exam before the scheduled date.
While many classes provide lab time, most students find it necessary to spend additional time outside class to complete assignments. Remember, you are developing computer skills, and skills require practice to master.
The general rule is one to two hours of studying outside of class for each hour spent in class.