diff --git a/src/events.rs b/src/events.rs
index 47e184b..ee112b4 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -19,7 +19,7 @@ pub struct Event {
     pub classes: Vec<StdType>,
     //class_sets: unknown
     pub teachers: Vec<StdType>,
-    //teacher_sets: unknown
+    // teacher_sets: Vec<StdType>?
     pub rooms: Vec<StdType>,
     //room_sets: unknown
     pub students: Vec<StdType>,
diff --git a/src/lesson.rs b/src/lesson.rs
index 35552d0..f6c111e 100644
--- a/src/lesson.rs
+++ b/src/lesson.rs
@@ -40,6 +40,7 @@ pub struct LessonStudentAbsence {
     pub student: LessonStudentInfo,
     //    "Absences": [], unknown
     pub student_released: bool,
+    pub school_event_ids: Option<Vec<String>>
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -59,7 +60,7 @@ pub struct AbsentTypeOption {
     pub absent_kind_enabled: bool,
     pub absent_kind_required: bool,
     pub absent_note_enabled: bool,
-    // AbsentKinds: [], unknown
+    pub absent_kinds: Vec<StdType>
     pub next_absent_type: String,
 }
 
diff --git a/src/what_if.rs b/src/what_if.rs
index 76d74bf..75a7f15 100644
--- a/src/what_if.rs
+++ b/src/what_if.rs
@@ -42,7 +42,7 @@ pub struct WhatIfResultMark {
     pub is_new: bool,
     pub is_points: bool,
     pub calculated_mark_text: String,
-    //ClassRankText: Option unknown,
+    pub class_rank_text: String,
     pub id: String,
     pub points_text: String,
     pub max_points: u16,
diff --git a/tracker.md b/tracker.md
index bc298e2..cb5a825 100644
--- a/tracker.md
+++ b/tracker.md
@@ -43,7 +43,7 @@
 - [ ] class_sets (event.rs) fix unknown type
 - [ ] teacher_sets (event.rs) fix unknown type
 - [ ] room_sets (event.rs) fix unknown type
-- [ ] ClassRankText (what_if.rs) fix unknown type
+- [x] ClassRankText (what_if.rs) fix unknown type
 - [ ] ClassBookRecordId (lesson.rs) fix unknown type
 - [ ] Absences (lesson.rs) fix unknown type
-- [ ] AbsentKinds (lesson.rs) fix unknown type
\ No newline at end of file
+- [x] AbsentKinds (lesson.rs) fix unknown type
\ No newline at end of file