Friend,
my first suggestion to you is to change your attitude a bit. See, going into the exam saying stuff like "I am not that intelligent" and "I don't need to score well" is hurtful to you for several reasons. While it is good to be realistic, being so down on you can only hurt you because you may be willing to settle for less. I am speaking based on my personal experience. The first time i took GMAT, i had the same thinking as you: i said there was no way for me to learn these concepts, and i don't care, so i'll just give it a shot. I scored 560 with no preparation whatsoever. 2 years later, i am studying my a** off for GMAT and hoping to near the 700 barrier. Everything is learn-able. You are obviously not mentally impaired which means you can learn all of these GMAT concepts and score well on the test. So, get your head up, and go crash this baby!
As far as your question goes... I've been told that if there is any place in the test you want to slow down and take your time, it would be the first 10 questions. This, however, doesn't mean to spend 40 minutes of first 10 Qs and then rush through the last 27. I suggest you take 25 mins for the first 12 questions, 25 minutes for the second 12, and 25 minutes for the last 13. Or, if you need even more time, try to dedicate 25 minutes to the first 10, 25 for the second 12 and 25 for the last 15. Either way, make sure you don't leave any questions unanswered because that will hurt you more than making mistakes early on.
Also, i suggest you dedicate more time to the first couple of questions in each area: Problem Solving and Data Sufficiency.
That's just my 2 cents, hope it helps