5A has to have Biology right before or after biology in 5B (the two classes have to have biology lesson on consecutive periods)

You will need to input two cardrelationships for this:

1. First specify that there shall not be a gap between lessons from certain group.
Select subjects, classes and "apply globaly":

2. However the above rule will consider as a gap only a space between the two lessons on the same day. So if Biology is on different days in 5A and 5B the software doesn't consider this as a gap. So you will need to add second cardrelationship that will force the lessons into the same day(s):

So if you have 3 biology lessons per week in 1A and 3 biology lessons in 1B you will simply request that both 5A and 5B have biology lessons on 3 days. Thus the biology lesson will be in both classes on the same day.