diff --git a/bookworm-to-trixie.yml b/bookworm-to-trixie.yml
deleted file mode 100644
index 193d226..0000000
--- a/bookworm-to-trixie.yml
+++ /dev/null
@@ -1,84 +0,0 @@
----
-- name: Upgrade Client from Bookworm to Trixie
-  hosts: all
-  remote_user: ansible
-  become: true
-
-  tasks:
-    - name: Update system to latest Bookworm
-      ansible.builtin.apt:
-        upgrade: full
-        update_cache: false
-        dpkg_options: "force-confdef,force-confold"
-      environment:
-        DEBIAN_FRONTEND: noninteractive
-
-    - name: Run apt autoremove
-      ansible.builtin.apt:
-        autoremove: true
-
-    - name: Remove backports for {{ ansible_distribution_release }}
-      ansible.builtin.apt_repository:
-        repo: "deb http://deb.debian.org/debian/ {{ ansible_distribution_release }}-backports main non-free-firmware"
-        state: absent
-        update_cache: false
-
-    - name: Change Debian Release from Bookworm to Trixie in /etc/apt/sources.list
-      ansible.builtin.replace:
-        path: "/etc/apt/sources.list"
-        regexp: "bookworm"
-        replace: "trixie"
-
-    - name: Run full package upgrade to Trixie
-      ansible.builtin.apt:
-        update_cache: true
-        upgrade: full
-        dpkg_options: "force-confdef,force-confold"
-      environment:
-        DEBIAN_FRONTEND: noninteractive
-
-    - name: Reboot client
-      ansible.builtin.reboot:
-        msg: "Client Reboot after Upgrade to Trixie"
-        reboot_timeout: 600
-
-    - name: Wait until the client is reachable after reboot
-      ansible.builtin.wait_for_connection:
-        timeout: 600
-
-    - name: Find all user home directories
-      ansible.builtin.find:
-        paths: /home
-        file_type: directory
-      register: user_homes
-
-    - name: Remove Nextcloud from Dolphin bookmarks
-      ansible.builtin.command: >
-        sed -i '/<bookmark href="file:\/\/\/lmn\/media\/.*\/nextcloud">/,/<\/bookmark>/d' {{ item }}/.local/share/user-places.xbel
-      loop: "{{ user_homes.files | map(attribute='path') | list }}"
-      when: item is match('^/home/.+')
-      ignore_errors: true
-
-    - name: Remove PAM Bind-Mounts block
-      ansible.builtin.blockinfile:
-        path: /etc/security/pam_mount.conf.xml
-        state: absent
-        marker: "<!-- {mark} ANSIBLE MANAGED BLOCK $bind mounts for VMs$ -->"
-
-    - name: Remove PAM Nextcloud-Mounts block
-      ansible.builtin.blockinfile:
-        path: /etc/security/pam_mount.conf.xml
-        state: absent
-        marker: "<!-- {mark} ANSIBLE MANAGED BLOCK $mount Nextcloud$ -->"
-
-    - name: Install qemu spice support
-      ansible.builtin.apt:
-        name: qemu-system-modules-spice
-
-    - name: Disable systemd-networkd.service
-      ansible.builtin.systemd:
-        name: systemd-networkd.service
-        enabled: false
-
-
-- import_playbook: lmn-client.yml
diff --git a/doc/exam_mode.md b/doc/exam_mode.md
index 439f1d7..246dd3a 100644
--- a/doc/exam_mode.md
+++ b/doc/exam_mode.md
@@ -2,15 +2,12 @@
 
 ## Description / use cases
 
-**Activating Exam Mode: Functionalities**
-
-When a user logs in with the `-exam` designation, the following functionalities will be activated:
-
-* The `firewalld.service` will start, blocking all incoming traffic. Additionally, it will restrict outgoing traffic to the addresses specified in `exam_destination_allowed_ipv4`, if this variable is set. Communication is permitted with devices listed in `exam_teacherpc_ips`, including the teacher PCs. By default, the IP of the teacher PC is determined by the client's IP, with the last digit in the last octet specified by `exam_teacherpc_last_digit`.
-
-* The home and media directories of `-exam` users will be renamed the following day and removed after a certain period. This is crucial because the `-exam` user will be created anew (with a new user ID) upon the initialization of Exam Mode. Without renaming/deleting the home and media directories, the new `-exam` user would be unable to log in on the same PC, especially on machines with local home configurations.
-
-
+Activating exam_mode provides following functionalities:
+* when -exam user logs in, firewalld.service will start and prevent communication between devices in the same local network
+* home- and media-directory of -exam users will be renamed (on the next day) and removed (after some days).  
+  This is important due the fact, that -exam user will be new created (with new user-id) on exam-mode initialisation.  
+  Without renaming/deleting the home- and media-directory, the -exam user couldn't log in twice on the same pc.  
+  Particularly important on machines with localhome
 
 ## Requirements
 
@@ -18,18 +15,10 @@ none
 
 ## Example
 
-Per default, all hosts will get `exam_mode`. But we don't want `exam_mode` on teacher devices. In `exam_mode` the Networks `10.0.0.0/24`, `10.0.1.0/24`, `192.168.122.0/24/24` will be reachable.
+Per default, all hosts will get exam_mode. But we don't want exam_mode on teacher devices
 
 inventory.yml
-
-```yml
-all:
-  vars:
-    exam_destination_allowed_ipv4:
-      - 10.0.0.0/24
-      - 10.0.1.0/24
-      - 192.168.122.0/24
-
+```
 teacherdevices:
   hosts:
     10.0.14.[1..75]