Please check the 2nd sentence. It's correct?
- What would you say are your strengths, and what are your weaknesses?
- I think that I can do my work very well, but sometimes I don't work as quickly as need.

Question

Answer

- I think (это "that" не нужно)  I can do my work very well, but sometimes I don't work as quickly as needed.
need - необхобимость
needed - нужно
Удачи и успехов. 
Если что-то не ясно, ты можешь спросить.

Answer

as needed.
as necessary.
as required.