Getting a specific docname in serverside script

I created a new doctype: job applicant test, and put this serverside script in job_applicant_test it:

import frappe
from frappe.model.document import Document

class Jobapplicanttest(Document):

def insert(data):
        data = frappe.parse_json(data)
        # doc = frappe.get_doc("job application test", data.get("docname"))  # Correct the DocType name
        doc = Jobapplicanttest(data.get("docname"))
        for item in data.get("questions"):
            row = doc.append("more_information", {})
            row.question = item.get("question")
            row.answer = item.get("answer")
        return {"message": "success2"}
    except Exception as e:
        error_message = str(e)
        frappe.log_error(frappe.get_traceback(), "insert_into_more_info_error")
        return {"message": error_message}

this should add the new questions and answers to a table called more information. However, when i pass any docname to this code it tells me “Doctype not found”