the most major/memorable event in my life is a basketball game at my college for several reasons.firstly,i gained lots of inspiration about life from this event.for example,my team was first behind;however,we never gave up and kept trying our best to beat the rival.we finally won the game.from then on,i know if i come across/encountered any troubles,once i try and make efforts,i can overcome them with confidence.also,i've learned how to coorperate with others during this process,and this enables me to do well in teamwork at university and work.
honestly,i dont think you have time to say the whole thing in one speaking task.i remember the test-taker gets only 45 seconds to answer.right?
you answer is in general fair,but you should pay more attention to the organization.word choice and grammar are the aspects you need to work hard on too.
good luck on your test!