diff --git a/src/ExamService/JsonRpcInterface/ExamServiceInterface.php b/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
index 575e216..f72e23e 100644
--- a/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
+++ b/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
@@ -99,6 +99,14 @@ interface ExamServiceInterface
      */
     public function submitWrongPractice(int $userId, array $params): array;
 
+    /**
+     * 获取用户薄弱项（有错题且正确率低于阈值且正确率最低的模块；无则 null）.
+     *
+     * 用于首页弹窗「薄弱项：{模块名}正确率低 → 攻克它 → 专项刷题」，
+     * 以及错题记录页面薄弱项展示；与错题记录首页统计字段 weak_category 同口径.
+     */
+    public function appGetWeakPoint(int $userId): ?array;
+
     /**
      * 获取考试类型列表（V1 兼容接口）.
      */