diff --git a/src/ExamService/JsonRpcInterface/ExamServiceInterface.php b/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
index f72e23e..4c3084e 100644
--- a/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
+++ b/src/ExamService/JsonRpcInterface/ExamServiceInterface.php
@@ -99,6 +99,13 @@ interface ExamServiceInterface
      */
     public function submitWrongPractice(int $userId, array $params): array;
 
+    /**
+     * 错题练习抽题：按分类抽取用户当前错题（仅错题，不足 num 时全量返回），随机排序.
+     *
+     * @param array $params category_id 分类ID（模块根或知识点）；num 抽题数量；get_correct 是否附带正确答案
+     */
+    public function getWrongPracticeQuestions(array $params, int $userId): 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）.
      *