Click on Add Existing | Entity and select Contact, as shown in the following screenshot:
Select the necessary assets that support your configuration and add them to your solution, or, for simplicity, select Add All Assets and click on Finish:
Click on No, do not include required components.
Navigate to Entities | Contacts | Fields.
Click on New, and create an attribute called Student Id of type Single Line of Text, and click on Save and New.
Create an Option Set attribute called Contact Type that contains two values; Student and Other. Then click on Save and Close.
Back in the solution, navigate to Entities | Contact | Forms and click on New | Main Form as per this screenshot:
In the newly created form, add the two newly created fields to your form by dragging and dropping the entities from the right-hand window onto the form.
Click on the Publish All Customizations button for your solution.
