Teacher invites BBC to tutor for failing grades

15 mins 27 secs

12 mins

10 mins 1 sec

31 mins 31 secs

9 mins 47 secs

12 mins 50 secs

12 mins 51 secs

14 mins 47 secs

7 mins

12 mins 58 secs

5 mins 40 secs

37 secs

6 mins

6 mins 10 secs

14 mins 5 secs

8 mins 37 secs

7 mins 10 secs

8 mins 20 secs

1 min 59 secs

35 mins 42 secs

6 mins 47 secs

13 mins 8 secs

7 mins

6 mins 5 secs

5 mins 5 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

10 mins 57 secs

1 min

6 mins

5 mins 35 secs