diff --git a/src/apps/flashexam.cpp b/src/apps/flashexam.cpp
index 0937b0d..089b87e 100644
--- a/src/apps/flashexam.cpp
+++ b/src/apps/flashexam.cpp
@@ -31,6 +31,7 @@ flashExam::flashExam(QWidget *parent)
     ui->didNotKnowBtn->setIcon(QIcon(":/resources/close.png"));
     ui->nextBtn->setIcon(QIcon(":/resources/check.png"));
     ui->nonRedundantRandomizationCheckBox->setDisabled(true);
+    ui->saveCardsNotKnownToFileCheckBox->setDisabled(true);
     ui->randomizeCheckBox->click();
     ui->randomizeCheckBox->setDisabled(true);
 
@@ -85,6 +86,7 @@ void flashExam::initCardsList(QString cardsList, QString answersList) {
     answersStringList = readFile(answersList).split(QRegExp("(\\r\\n)|(\\n\\r)|\\r|\\n"), QString::SkipEmptyParts);
     randomize = ui->randomizeCheckBox->isChecked();
     nonRedundantRandomization = ui->nonRedundantRandomizationCheckBox->isChecked();
+    saveCardsNotKnownToFile = ui->saveCardsNotKnownToFileCheckBox->isChecked();
     cardsAlreadyShown.clear();
     cardsNotKnown.clear();
     ui->nonRedundantRandomizationCheckBox->setChecked(false);
@@ -95,7 +97,7 @@ void flashExam::initCardsList(QString cardsList, QString answersList) {
 
 void flashExam::on_backBtn_clicked()
 {
-    if(nonRedundantRandomization) {
+    if(nonRedundantRandomization && cardsNotKnown.count() > 0 && saveCardsNotKnownToFile) {
         QString cardsNotKnownQstring;
         for(int i = 0; i < cardsNotKnown.count(); i++) {
             cardsNotKnownQstring.append(cardsStringList.at(cardsNotKnown.at(i)) + "\n");
@@ -229,3 +231,14 @@ void flashExam::on_didNotKnowBtn_clicked()
     on_nextBtn_clicked();
 }
 
+void flashExam::on_nonRedundantRandomizationCheckBox_toggled(bool checked)
+{
+    if(checked) {
+        ui->saveCardsNotKnownToFileCheckBox->setDisabled(false);
+    }
+    else {
+        ui->saveCardsNotKnownToFileCheckBox->setDisabled(true);
+        ui->saveCardsNotKnownToFileCheckBox->setChecked(false);
+    }
+}
+
diff --git a/src/apps/flashexam.h b/src/apps/flashexam.h
index c0f444c..059c9b6 100644
--- a/src/apps/flashexam.h
+++ b/src/apps/flashexam.h
@@ -24,6 +24,7 @@ private:
     QString listName;
     bool randomize;
     bool nonRedundantRandomization;
+    bool saveCardsNotKnownToFile;
     QList<int> cardsAlreadyShown;
     QList<int> cardsNotKnown;
     bool answerShown = false;
@@ -45,6 +46,7 @@ private slots:
     void on_nextBtn_clicked();
     void on_randomizeCheckBox_toggled(bool checked);
     void on_didNotKnowBtn_clicked();
+    void on_nonRedundantRandomizationCheckBox_toggled(bool checked);
 };
 
 #endif // FLASHEXAM_H
diff --git a/src/apps/flashexam.ui b/src/apps/flashexam.ui
index 9c0a541..2fd2227 100644
--- a/src/apps/flashexam.ui
+++ b/src/apps/flashexam.ui
@@ -35,46 +35,6 @@
        </property>
        <item>
         <layout class="QGridLayout" name="gridLayout">
-         <item row="2" column="0">
-          <widget class="Line" name="line">
-           <property name="frameShadow">
-            <enum>QFrame::Shadow::Plain</enum>
-           </property>
-           <property name="lineWidth">
-            <number>2</number>
-           </property>
-           <property name="orientation">
-            <enum>Qt::Orientation::Horizontal</enum>
-           </property>
-          </widget>
-         </item>
-         <item row="4" column="0">
-          <widget class="QCheckBox" name="randomizeCheckBox">
-           <property name="font">
-            <font>
-             <family>U001</family>
-            </font>
-           </property>
-           <property name="text">
-            <string>Randomized mode</string>
-           </property>
-          </widget>
-         </item>
-         <item row="3" column="0">
-          <widget class="QListWidget" name="listWidget"/>
-         </item>
-         <item row="7" column="0">
-          <widget class="QPushButton" name="startBtn">
-           <property name="font">
-            <font>
-             <bold>true</bold>
-            </font>
-           </property>
-           <property name="text">
-            <string>Start</string>
-           </property>
-          </widget>
-         </item>
          <item row="1" column="0">
           <layout class="QGridLayout" name="gridLayout_2">
            <property name="bottomMargin">
@@ -142,7 +102,7 @@
            </item>
           </layout>
          </item>
-         <item row="6" column="0">
+         <item row="7" column="0">
           <widget class="Line" name="line_2">
            <property name="frameShadow">
             <enum>QFrame::Shadow::Plain</enum>
@@ -152,6 +112,19 @@
            </property>
           </widget>
          </item>
+         <item row="2" column="0">
+          <widget class="Line" name="line">
+           <property name="frameShadow">
+            <enum>QFrame::Shadow::Plain</enum>
+           </property>
+           <property name="lineWidth">
+            <number>2</number>
+           </property>
+           <property name="orientation">
+            <enum>Qt::Orientation::Horizontal</enum>
+           </property>
+          </widget>
+         </item>
          <item row="5" column="0">
           <widget class="QCheckBox" name="nonRedundantRandomizationCheckBox">
            <property name="font">
@@ -164,6 +137,45 @@
            </property>
           </widget>
          </item>
+         <item row="4" column="0">
+          <widget class="QCheckBox" name="randomizeCheckBox">
+           <property name="font">
+            <font>
+             <family>U001</family>
+            </font>
+           </property>
+           <property name="text">
+            <string>Randomized mode</string>
+           </property>
+          </widget>
+         </item>
+         <item row="8" column="0">
+          <widget class="QPushButton" name="startBtn">
+           <property name="font">
+            <font>
+             <bold>true</bold>
+            </font>
+           </property>
+           <property name="text">
+            <string>Start</string>
+           </property>
+          </widget>
+         </item>
+         <item row="3" column="0">
+          <widget class="QListWidget" name="listWidget"/>
+         </item>
+         <item row="6" column="0">
+          <widget class="QCheckBox" name="saveCardsNotKnownToFileCheckBox">
+           <property name="font">
+            <font>
+             <family>U001</family>
+            </font>
+           </property>
+           <property name="text">
+            <string>Save forgotten cards list to file</string>
+           </property>
+          </widget>
+         </item>
         </layout>
        </item>
       </layout>