diff --git a/recopytex/dashboard/pages/exams_scores/models.py b/recopytex/dashboard/pages/exams_scores/models.py
index 4d7df5c..e3386af 100644
--- a/recopytex/dashboard/pages/exams_scores/models.py
+++ b/recopytex/dashboard/pages/exams_scores/models.py
@@ -2,7 +2,7 @@
 # encoding: utf-8
 
 from recopytex.database.filesystem.loader import CSVLoader
-from recopytex.lib.dataframe import column_values_to_column
+from recopytex.datalib.dataframe import column_values_to_column
 
 LOADER = CSVLoader("./test_config.yml")
 
@@ -22,7 +22,7 @@ def get_record_scores(exam):
 def get_unstack_scores(exam):
     flat_scores = LOADER.get_exam_scores(exam)
     kept_columns = [col for col in LOADER.score_columns if col != "score"]
-    return column_values_to_column(flat_scores, "student_name", "score", kept_columns)
+    return column_values_to_column("student_name", "score", kept_columns, flat_scores)
 
 
 def get_students_from_exam(exam):
diff --git a/recopytex/datalib/dataframe.py b/recopytex/datalib/dataframe.py
new file mode 100644
index 0000000..d1b5845
--- /dev/null
+++ b/recopytex/datalib/dataframe.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# encoding: utf-8
+
+
+def column_values_to_column(pivot_column, value_column, kept_columns, df):
+    """Pivot_column's values go to column with value_column under it, keeping kept_columns
+
+    :param pivot_column: column name where value will become columns
+    :param value_column: column name where value will be under pivot_column
+    :param kept_columns: unchanged columns
+    :param df: DataFrame to work with
+
+    :return: Stack dataframe
+
+    """
+    if pivot_column in kept_columns:
+        pivot_columns = kept_columns
+    else:
+        pivot_columns = kept_columns + [pivot_column]
+
+    return df.set_index(pivot_columns).unstack(pivot_column)[value_column].reset_index()