Komma

Hej:)

Jeg skal indsætte komma i nedenstående tekst, hvilket jeg har prøvet - Nogen der vil se om det er rigtigt gjort?

a) Krishan Radia a six-year-old from Kenton in north-west London, is the youngest person ever to pass O-levels.
b) The boy gained C-grade in Information Systems, after studying for only four hours a week, at Ryde College, a private tutorial institute in Northwood.
c) Michael Ryde a part-time teacher, said the college uses state-of-the-art computer equipment.
d) Children can learn a tremendous amount of maths, sciens, computers and languages.
e) The boy's mother a 35-year-old, travel agent said he worked well under pressure.
f) Tom who will be seven in October said he was happy to attend evening classes, instead of playing with his friends.
 

- Tak