diff --git a/list-generator/backend/app/services/pdf_generator.py b/list-generator/backend/app/services/pdf_generator.py
index 44263367..7f7864cd 100644
--- a/list-generator/backend/app/services/pdf_generator.py
+++ b/list-generator/backend/app/services/pdf_generator.py
@@ -5,10 +5,26 @@ from weasyprint import HTML
 import datetime
 
 def generate_school_pdf(institution: str, date_info: str, list_type: str, students_csv_path: str, families_csv_path: str = None, output_dir: str = "/tmp") -> str:
-    df = pd.read_csv(students_csv_path, sep=";")
+    try:
+        df = pd.read_csv(students_csv_path, sep=";", encoding="utf-8-sig")
+    except Exception:
+        df = pd.read_csv(students_csv_path, sep=";", encoding="latin1")
     df.columns = df.columns.str.strip()
-    if "Klasse" not in df.columns:
-        df["Klasse"] = "Alle"
+    col_mapping = {}
+    for col in df.columns:
+        lower_col = col.lower()
+        if lower_col in ["vorname kind", "vorname"]:
+            col_mapping[col] = "Vorname"
+        elif lower_col in ["nachname kind", "nachname"]:
+            col_mapping[col] = "Nachname"
+        elif lower_col in ["gruppe", "klasse"]:
+            col_mapping[col] = "Klasse"
+    df = df.rename(columns=col_mapping)
+    df = df.fillna("")
+    if "Vorname" not in df.columns: df["Vorname"] = ""
+    if "Nachname" not in df.columns: df["Nachname"] = ""
+    if "Klasse" not in df.columns: df["Klasse"] = "Alle"
+    df = df.sort_values(by=["Klasse", "Nachname", "Vorname"])
     grouped = df.groupby("Klasse")
     class_data = []
     for class_name, group in grouped: