You can see your own marks once your teacher has returned your work.
Where to look
Open the classroom from your sidebar. Each card on the Assignments tab has a line underneath that tells you where the work stands.
Returned • [your teacher] left feedback: your marks and feedback are ready, and you have not looked yet.
Completed • 4/5: you have looked at your returned work, and the card now shows your mark.
Submitted • Not marked yet: you have handed it in and your teacher has not returned it yet.
Returned • Feedback on 2 lessons: on a pathway, this many lessons inside it have new feedback.
Lessons that give you feedback straight away, as you answer or when you submit, skip the waiting and go straight to Completed.
The Grades tab
For every mark in one place, open the Grades tab. Returned means your marks and feedback are in. Submitted means you have handed it in, and the score says Hidden until returned until your teacher sends it back. A green tick on Submitted means the lesson gave you feedback straight away, so your score is already there. To see the score for each lesson in a pathway, hover over the pathway's icon and click the arrow that appears.
Click any row to open the lesson and go through the pages: each question shows what you scored, and long answers show written feedback. See Reviewing your marks and feedback in lessons.