Flutter - How set all my data (fields) from firebase documents to table

I'm trying to get all user data fields from documents to table to compare users scores live.

This is my Firestore document:

right now the only thing I success to get is only the Collection Id and the documents files name(the uuid). any idea how to get user data fields?

this is what I've built for now:

import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:flutter/material.dart';
import '../welcome/welcome_screen.dart';

class Records extends StatefulWidget {
  @override
  _RecordsState createState() => _RecordsState();
}

@override
class _RecordsState extends State<Records> {
  @override
  Widget build(BuildContext context) {
    return Center(
      child: new Scaffold(
        appBar: AppBar(
            title: Text(" טבלת שיאים לשאלון מספר - " + IDController.text)),
        body: new Stack(
          fit: StackFit.expand,
          children: [
            new Image(
              image: AssetImage(
                "assets/background/zooc.jpg",
              ),
              fit: BoxFit.cover,
              height: double.infinity,
              width: double.infinity,
              alignment: Alignment.center,
            ),
            new StreamBuilder(
              stream: FirebaseFirestore.instance
                  .collection(IDController.text)
                  .orderBy('studentScore', descending: true)
                  .snapshots(),
              builder: (context, snapshot) {
                if (snapshot.hasError) return Text('Error = ${snapshot.error}');
                if (snapshot.hasData) return new Text('המערכת טוענת נתונים...');
                return new DataTable(
                  columns: <DataColumn>[
                    new DataColumn(label: Text('studentName')),
                    new DataColumn(label: Text('studentScore')),
                    new DataColumn(label: Text('endTime')),
                  ],
                  rows: _createRows(snapshot.data),
                );
              },
            ),
          ],
        ),
      ),
    );
  }

  List _createRows(QuerySnapshot snapshot) {
    List newList = snapshot.docs.map(
      (DocumentSnapshot documentSnapshot) {
        return new DataRow(
          cells: [
            DataCell(Text(documentSnapshot['studentName'].toString())),
            DataCell(Text(documentSnapshot['studentScore'].toString())),
            DataCell(Text(documentSnapshot['endTime'].toString())),
          ],
        );
      },
    ).toList();
    return newList;
  }
}

Thanks, Kobi