diff --git a/rating_api/routes/lecturer.py b/rating_api/routes/lecturer.py
index 1bdd563..d069acb 100644
--- a/rating_api/routes/lecturer.py
+++ b/rating_api/routes/lecturer.py
@@ -51,22 +51,36 @@ async def get_lecturer(id: int, info: list[Literal["comments", "mark"]] = Query(
     if lecturer is None:
         raise ObjectNotFound(Lecturer, id)
     result = LecturerGet.model_validate(lecturer)
-    result.comments = None
-    if lecturer.comments:
-        approved_comments: list[CommentGet] = [
-            CommentGet.model_validate(comment)
-            for comment in lecturer.comments
-            if comment.review_status is ReviewStatus.APPROVED
-        ]
-        if "comments" in info and approved_comments:
-            result.comments = approved_comments
-        if "mark" in info and approved_comments:
-            result.mark_freebie = sum(comment.mark_freebie for comment in approved_comments) / len(approved_comments)
-            result.mark_kindness = sum(comment.mark_kindness for comment in approved_comments) / len(approved_comments)
-            result.mark_clarity = sum(comment.mark_clarity for comment in approved_comments) / len(approved_comments)
-            result.mark_general = sum(comment.mark_general for comment in approved_comments) / len(approved_comments)
-        if approved_comments:
-            result.subjects = list({comment.subject for comment in approved_comments})
+    result.comments = list()
+
+    subjects_set = set()  # множество для предметов
+    if "mark" in info:
+        result.mark_freebie, result.mark_clarity, result.mark_kindness, result.mark_general = 0, 0, 0, 0
+        aproved_comment_count = 0
+    for comment in lecturer.comments:
+        if comment.review_status is ReviewStatus.APPROVED:
+            comment = CommentGet.model_validate(comment)
+        else:
+            continue
+        if "comments" in info:
+            result.comments.append(comment)
+        if "mark" in info:
+            aproved_comment_count += 1
+            result.mark_freebie += comment.mark_freebie
+            result.mark_clarity += comment.mark_clarity
+            result.mark_kindness += comment.mark_kindness
+            result.mark_general += comment.mark_general
+        if comment.subject is not None:
+            subjects_set.add(comment.subject)
+    if "mark" in info:
+        result.mark_clarity /= aproved_comment_count
+        result.mark_freebie /= aproved_comment_count
+        result.mark_kindness /= aproved_comment_count
+        result.mark_general /= aproved_comment_count
+    if len(result.comments) == 0:
+        result.comments = None
+    if len(subjects_set) != 0:
+        result.subjects = list(subjects_set)
     return result
 
 
@@ -137,6 +151,7 @@ async def get_lecturers(
             if "comments" in info and approved_comments:
                 lecturer_to_result.comments = approved_comments
             if "mark" in info and approved_comments:
+
                 lecturer_to_result.mark_freebie = sum([comment.mark_freebie for comment in approved_comments]) / len(
                     approved_comments
                 )
@@ -149,6 +164,7 @@ async def get_lecturers(
                 lecturer_to_result.mark_general = sum(comment.mark_general for comment in approved_comments) / len(
                     approved_comments
                 )
+
             if approved_comments:
                 lecturer_to_result.subjects = list({comment.subject for comment in approved_comments})
         result.lecturers.append(lecturer_to_result)