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The modal verb ‘should’ can be used to express both advice and probability or expectation.
advice – suggestion or recommendation
If you are driving to London, you should avoid rush hour.
If you are still feeling ill you should see a doctor.
It is a good idea to avoid rush hour. You can ignore this advice but you will probably end up in a traffic jam.
It is a good idea to see a doctor. You can ignore this advice but it is possible that your health will get worse if you decide not to see a doctor.
probability/expectation – something that is likely to happen
He should pass his driving test with ease because he is an excellent driver.
She is feeling better now and should be back at work on Monday.
I can see that he is a good driver so I think that he will pass his test / it is likely that he will pass his test.
I can see that this person who has been ill is getting much better so I think she will be back at work on Monday / it is likely that she will be back at work on Monday.