diff --git a/lib/controllers/gpacalculator_controller.dart b/lib/controllers/gpacalculator_controller.dart
index c1cbd51..a9b93be 100644
--- a/lib/controllers/gpacalculator_controller.dart
+++ b/lib/controllers/gpacalculator_controller.dart
@@ -1,4 +1,5 @@
 import 'package:academia/models/courses.dart';
+import 'package:flutter/widgets.dart';
 import 'package:get/get.dart';
 
 class GPACalculatorController extends GetxController {
@@ -7,9 +8,18 @@ class GPACalculatorController extends GetxController {
   List<Unit> get courseList => _courses;
   double get gpa => _calculateGPA();
 
-  void addCourse(String name, String code, double creditHours, String grade) {
+  void addCourse(String name, String code, String creditHours, String grade) {
+    double tcreditHours = 0;
+    try {
+      tcreditHours = double.parse(creditHours);
+    } catch (e) {
+      Get.defaultDialog(
+          title: "Incorrect credit Hours",
+          content: const Text("Credit hours must be a number"));
+      throw Exception('Credit hours must be a number');
+    }
     final course =
-        Unit(name: name, code: code, creditHours: creditHours, grade: grade);
+        Unit(name: name, code: code, creditHours: tcreditHours, grade: grade);
     _courses.add(course);
   }
 
@@ -22,11 +32,18 @@ class GPACalculatorController extends GetxController {
       {required int index,
       required String newName,
       required String newCode,
-      required double newCreditHours,
+      required String newCreditHours,
       required String newGrade}) {
     _courses[index].name = newName;
     _courses[index].code = newCode;
-    _courses[index].creditHours = newCreditHours;
+    try {
+      _courses[index].creditHours = double.parse(newCreditHours);
+    } catch (e) {
+      Get.defaultDialog(
+          title: "Incorrect credit Hours",
+          content: const Text("Credit hours must be a number"));
+      throw Exception('Credit hours must be a number');
+    }
     _courses[index].grade = newGrade;
     _courses.refresh();
   }
@@ -38,8 +55,6 @@ class GPACalculatorController extends GetxController {
       totalPoints += getGradePoints(course.grade) * course.creditHours;
       totalCreditHours += course.creditHours;
     }
-    print(totalPoints.toString());
-    print(totalCreditHours.toString());
     return (totalPoints / totalCreditHours).toPrecision(2);
   }
 
diff --git a/lib/pages/gpacalculator_page.dart b/lib/pages/gpacalculator_page.dart
index 2a1d248..39b57a5 100644
--- a/lib/pages/gpacalculator_page.dart
+++ b/lib/pages/gpacalculator_page.dart
@@ -43,9 +43,14 @@ class GpaCalculator extends StatelessWidget {
             const SizedBox(height: 20),
             ElevatedButton(
               onPressed: () {
+                if (unitController.courseList.length.isEqual(0)) {
+                  Get.defaultDialog(
+                      title: "List empty",
+                      content: const Text("Input Grades!"));
+                }
                 Get.defaultDialog(
                   title: "Your GPA",
-                  content: Text("Your GPA is ${unitController.gpa}"),
+                  content: Text("Your GPA is ${unitController.gpa.toString()}"),
                 );
               },
               child: const Text("Calculate GPA"),
@@ -121,6 +126,8 @@ class GpaCalculator extends StatelessWidget {
                                           Padding(
                                             padding: const EdgeInsets.all(8.0),
                                             child: TextField(
+                                              keyboardType:
+                                                  TextInputType.number,
                                               decoration: const InputDecoration(
                                                 border: OutlineInputBorder(),
                                                 labelText: 'Credit Hours',
@@ -161,9 +168,8 @@ class GpaCalculator extends StatelessWidget {
                                                               codeController
                                                                   .text,
                                                           newCreditHours:
-                                                              double.parse(
-                                                                  creditHoursController
-                                                                      .text),
+                                                              creditHoursController
+                                                                  .text,
                                                           newGrade:
                                                               gradeController
                                                                   .text);
@@ -262,6 +268,7 @@ class GpaCalculator extends StatelessWidget {
                                 Padding(
                                   padding: const EdgeInsets.all(8.0),
                                   child: TextField(
+                                    keyboardType: TextInputType.number,
                                     decoration: const InputDecoration(
                                       border: OutlineInputBorder(),
                                       labelText: 'Credit Hours',
@@ -289,8 +296,13 @@ class GpaCalculator extends StatelessWidget {
                                   onPressed: () {
                                     final name = nameController.text;
                                     final code = codeController.text;
-                                    final creditHours = double.parse(
-                                        creditHoursController.text);
+                                    final creditHours =
+                                        creditHoursController.text;
+
+                                    // if (creditHours is! double) {
+                                    //   Get.snackbar("Invalid Credit hours",
+                                    //       "Must be a number");
+                                    // }
                                     final grade = gradeController.text;
                                     if (nameController.text != '' &&
                                         codeController.text != '' &&
@@ -304,7 +316,7 @@ class GpaCalculator extends StatelessWidget {
                                       } else {
                                         Get.defaultDialog(
                                           title: "Invalid Grade",
-                                          content: Text(
+                                          content: const Text(
                                               "Please enter a valid grade"),
                                         );
                                       }
diff --git a/lib/pages/tool_page.dart b/lib/pages/tool_page.dart
index 61d8b4a..3622fbb 100644
--- a/lib/pages/tool_page.dart
+++ b/lib/pages/tool_page.dart
@@ -25,7 +25,7 @@ class ToolsPage extends StatelessWidget {
               Get.to(
                 const WebviewPage(
                     title: "Daystar Elearning",
-                    url: "https://student.daystar.ac.ke"),
+                    url: "https://elearning.daystar.ac.ke"),
               );
             },
             icon: const Icon(