Teacher invites BBC to tutor for failing grades

1 hour 24 mins 19 secs

15 mins 27 secs

5 mins 26 secs

10 mins 1 sec

9 mins 47 secs

12 mins 51 secs

14 mins 47 secs

7 mins

5 mins 40 secs

15 mins 47 secs

14 mins

37 secs

13 mins 36 secs

8 mins 37 secs

12 mins 11 secs

7 mins 10 secs

8 mins 20 secs

12 mins 48 secs

8 mins

7 mins 14 secs

1 min 59 secs

6 mins 47 secs

7 mins 52 secs

5 mins 5 secs

27 mins 52 secs

6 mins 15 secs

1 min 1 sec

11 mins 34 secs

10 mins 29 secs

2 mins 10 secs

8 mins 12 secs

6 mins 1 sec

6 mins

6 mins 2 secs

6 mins 2 secs

5 mins 59 secs

10 mins 48 secs

15 mins 11 secs

10 mins 2 secs

6 mins 5 secs