Login as your school admin and go to Courses---->Tests ---> Create Test/Your test ---> Test builder.
When you click on Create or open an existing test, you will go to test builder page. Click or drag and drop a section to add section to your test.
Click on Multiple Choice button on the side bar or drag and drop to add multiple choice questions to your sections.
In Question builder page you can create your multiple choice question. If you are framing maths questions you have like Equation editor.Click on Save to save the question.
Fill in the question and the answer choices. Select the multi answers check box if you want to set the question with multiple answers.
once you are done with creation of multiple choice questions you can click on Back button and in Test Builder click on Publish to publish your test.