Tier 4 help please!

[adaya]

hey everyone,

I applied for intensive english course (15 hours per week)
for 9 month.
the academy sent me student visitor visa latter,I'm applying for
tier 4 visa,as my course is over 6 month period,
i looked on UK border agency about my academy tier 4 sponser,
and the academy does show in the list has high trust 4 tier visa sponser.

my question is - am i able to apply for tier 4 visa with my course?
or is that only for high education studies?
i know tier 4 it's for over 6 month time studies but maybe because that's a english course i need to apply for student visitor extended visa?
or should i ask for a new visa latter which supports tier 4 visa?

really confused
thanks for the help