Getting errors when I submit my postman training collection

All my test are passing but still getting below errors when submitting.

“completed”: false,
“message”: “Oops! Your collection is still missing some parts. Check out what’s missing below and go back through the steps in the request documentation. :slightly_smiling_face:”,
“fails”: [
“No pre-request script included”,
“Not all tests included”,
“No script parsing response body with pm.response.json syntax (each request)”,
“No script setting a global variable (requests 1-3)”,
“Assignment 1: Save sku variable - not completed”,
“Assignment 2: Save orderId - not completed”,
“Assignment 3: Check for 201 status - not completed”,
“Assignment 4: Check created property - not completed”,
“Assignment 4: Check for true value - not completed”,
“Assignment 4: Check for number - not completed”,
“No to.have.status test (requests 1, 3)”,
“No test (request 1)”,
“No type check (requests 1-3)”,
“No to.eql property value equality check (request 2)”,
“No script setting request execution order (request 4)”,
“No to.have.jsonSchema validation test (request 4)”