diff --git a/app/api/partitions.py b/app/api/partitions.py
index 886a0d82b1..20b92ce30d 100644
--- a/app/api/partitions.py
+++ b/app/api/partitions.py
@@ -148,6 +148,19 @@ def set_etud_group(etudid: int, group_id: int):
         group.etuds.append(etud)
         log(f"set_etud_group({etud}, {group})")
     db.session.commit()
+    sco_cache.invalidate_formsemestre(group.partition.formsemestre_id)
+    return jsonify({"group_id": group_id, "etudid": etudid})
+
+
+@bp.route("/group/<int:group_id>/remove_etudiant/<int:etudid>", methods=["POST"])
+@permission_required_api(Permission.ScoEtudChangeGroups, Permission.APIEditGroups)
+def group_remove_etud(group_id: int, etudid: int):
+    """Retire l'étudiant de ce groupe. S'il n'y est pas, ne fait rien."""
+    etud = Identite.query.get_or_404(etudid)
+    group = GroupDescr.query.get_or_404(group_id)
+    group.etuds.remove(etud)
+    db.session.commit()
+    sco_cache.invalidate_formsemestre(group.partition.formsemestre_id)
     return jsonify({"group_id": group_id, "etudid": etudid})
 
 
@@ -156,8 +169,11 @@ def set_etud_group(etudid: int, group_id: int):
 )
 @permission_required_api(Permission.ScoEtudChangeGroups, Permission.APIEditGroups)
 def partition_remove_etud(partition_id: int, etudid: int):
-    """ """
+    """Enlève l'étudiant de tous les groupes de cette partition
+    (NB: en principe, un étudiant ne doit être que dans 0 ou 1 groupe d'une partition)
+    """
     etud = Identite.query.get_or_404(etudid)
+    partition = Partition.query.get_or_404(partition_id)
     groups = (
         GroupDescr.query.filter_by(partition_id=partition_id)
         .join(group_membership)
@@ -166,6 +182,7 @@ def partition_remove_etud(partition_id: int, etudid: int):
     for g in groups:
         g.etuds.remove(etud)
     db.session.commit()
+    sco_cache.invalidate_formsemestre(partition.formsemestre_id)
     return jsonify({"partition_id": partition_id, "etudid": etudid})
 
 
@@ -302,6 +319,7 @@ def formsemestre_order_partitions(formsemestre_id: int):
         p.numero = numero
         db.session.add(p)
     db.session.commit()
+    sco_cache.invalidate_formsemestre(formsemestre_id)
     return jsonify(formsemestre.to_dict())
 
 
@@ -325,6 +343,7 @@ def partition_order_groups(partition_id: int):
         group.numero = numero
         db.session.add(group)
     db.session.commit()
+    sco_cache.invalidate_formsemestre(partition.formsemestre_id)
     return jsonify(partition.to_dict(with_groups=True))
 
 
diff --git a/tests/api/exemple-api-basic.py b/tests/api/exemple-api-basic.py
index 9d03946b2a..b03b9ff64f 100644
--- a/tests/api/exemple-api-basic.py
+++ b/tests/api/exemple-api-basic.py
@@ -59,7 +59,7 @@ def GET(path: str, headers={}, errmsg=None):
     """Get and returns as JSON"""
     r = requests.get(API_URL + path, headers=headers or HEADERS, verify=CHK_CERT)
     if r.status_code != 200:
-        raise ScoError(errmsg or f"""erreur status={r.status_code} !\n{r.json()}""")
+        raise ScoError(errmsg or f"""erreur status={r.status_code} !\n{r.text}""")
     return r.json()  # decode la reponse JSON
 
 
@@ -72,7 +72,7 @@ def POST(path: str, data: dict = {}, headers={}, errmsg=None):
         verify=CHK_CERT,
     )
     if r.status_code != 200:
-        raise ScoError(errmsg or f"erreur status={r.status_code} !\n{r.json()}")
+        raise ScoError(errmsg or f"erreur status={r.status_code} !\n{r.text}")
     return r.json()  # decode la reponse JSON
 
 
@@ -85,7 +85,7 @@ def POST_JSON(path: str, data: dict = {}, headers={}, errmsg=None):
         verify=CHK_CERT,
     )
     if r.status_code != 200:
-        raise ScoError(errmsg or f"erreur status={r.status_code} !\n{r.json()}")
+        raise ScoError(errmsg or f"erreur status={r.status_code} !\n{r.text}")
     return r.json()  # decode la reponse JSON
 
 
@@ -169,17 +169,31 @@ pp(partitions)
 POST_JSON(f"/group/5559/delete")
 POST_JSON(f"/group/5327/edit", data={"group_name": "TDXXX"})
 
-POST_JSON(
+# 1- Crée une partition, puis la change de nom
+js = POST_JSON(
     f"/formsemestre/{formsemestre_id}/partition/create",
-    data={"partition_name": "PXXXXYY"},
+    data={"partition_name": "PART"},
 )
-
+partition_id = js["id"]
 POST_JSON(
-    f"/partition/{2379}/edit",
-    data={"partition_name": "---PPPP", "show_in_lists": True},
+    f"/partition/{partition_id}/edit",
+    data={"partition_name": "PART1", "show_in_lists": True},
 )
 
-POST_JSON(f"/partition/{2379}/delete")
+# 2- Crée un groupe
+js = POST_JSON(f"/partition/{partition_id}/group/create", data={"group_name": "GG"})
+group_id = js["id"]
+# Prend un étudiant au hasard dans le semestre
+etud = GET(f"/formsemestre/{formsemestre_id}/etudiants")[10]
+etudid = etud["id"]
+# 3- Affecte étudiant au groupe
+POST_JSON(f"/group/{group_id}/set_etudiant/{etudid}")
+
+# 4- retire du groupe
+POST_JSON(f"/group/{group_id}/remove_etudiant/{etudid}")
+
+# Suppression
+POST_JSON(f"/partition/{partition_id}/delete")
 
 #
 POST_JSON(