Teacher invites BBC to tutor for failing grades

15 mins 27 secs

10 mins 1 sec

14 mins 47 secs

16 mins 2 secs

7 mins

5 mins 40 secs

37 secs

6 mins 10 secs

8 mins 37 secs

7 mins 10 secs

8 mins 20 secs

5 mins

8 mins

2 mins 57 secs

9 mins 55 secs

10 mins 13 secs

9 mins 45 secs

1 min 8 secs

14 mins 1 sec

6 mins 5 secs

6 mins 56 secs

32 mins 15 secs

27 mins 52 secs

11 mins 11 secs

1 min 1 sec

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

5 mins 57 secs

5 mins 23 secs

1 min 8 secs

1 min 5 secs

5 mins 35 secs

13 mins 8 secs