Levels of keywords

1.Low level keywords :
If the keyword competition (in Google) is <= 4 digits then it is considered as low level keyword. For low-level keyword we can optimize a website with in 3 months.

2.Medium level keywords :
If the keyword competition (in Google) is <= 7 digits it is considered as medium level keyword, For medium -level key words we can optimize our site with in 6 to 7 months.

3.High level keywords :
if keyword competition is above or equal to 8 digits it is considered as high level keyword .we can optimize these high level keyword in 1year.