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# MAT Prep Thread - 2nd November 2016

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1. Can someone help me with 1E on 2014? I keep getting 81?
I got two solutions of the first derivative as x=0,x=60deg so when i sub in 60 deg it wworks out as 81? I am so confused where I've gone wrong.
2. (Original post by Mystery.)
Can someone help me with 1E on 2014? I keep getting 81?
I got two solutions of the first derivative as x=0,x=60deg so when i sub in 60 deg it wworks out as 81? I am so confused where I've gone wrong.
Have you tried manipulating the expression?
3. (Original post by Injective)
Have you tried manipulating the expression?
Yeah I understand you can do that but I don't get why taking the derivative gives you the wrong answer..
4. (Original post by Mystery.)
Yeah I understand you can do that but I don't get why taking the derivative gives you the wrong answer..
Yes, I get 36 for x=pi/3 - giving us the largest value.

Edit: show your working, as I don't know where you went wrong.
5. (Original post by Mystery.)
Yeah I understand you can do that but I don't get why taking the derivative gives you the wrong answer..
You're putting 60 degrees in wrong - specifically I think you're not squaring sqrt(3)/2 to 3/4.
6. (Original post by Mystery.)
Yeah I understand you can do that but I don't get why taking the derivative gives you the wrong answer..
Post your working, so we can see where you went wrong.
7. this might seem like a stupid question, but are you allowed a ruler in the exam? As far as I know, you can take a pen and compass, but a ruler has never been stated.
8. (Original post by RichE)
You're putting 60 degrees in wrong - specifically I think you're not squaring sqrt(3)/2 to 3/4.
You are right!
Oh my god that was stupid.
Thankyou
9. Is 81 a competitive score for MAT? I saw from its official website that the average mark of successful applicants is 70 something, but since my grades are not that good, would I need a 90 to secure a place ( I missed 10 marks due to a mistake in addition )? Also when should I do the 2015 paper? Are there other questions with difficulty and style similar to later MATs? Coz i know the earlier ones are easy...
10. fyi the 81 mark thing is 2014 and i got 93 in 2012
11. can anyone help out with Q4 of 2011? I just dont think i'm following the question at all. I can sketch the graphs but i dont really see any relation? ANy hints pls? thanks!
12. (Original post by danielhx)
can anyone help out with Q4 of 2011? I just dont think i'm following the question at all. I can sketch the graphs but i dont really see any relation? ANy hints pls? thanks!
What graphs? Do you mean the lines x+y = constant, and curves xy = constant?

You can see from them how x+y increases. The largest value x+y can take is the value taken on the last line to intersect Q.
13. (Original post by LaserRanger)
fyi the 81 mark thing is 2014 and i got 93 in 2012
Congrats, those are really good marks.

For more recent exams (I believe 2010 onwards?), there are examiner reports on the website, below the test solutions. They give you a breakdown of how many applications and offers were made to each course.

In a few of those (including the 2014 paper), there's a graph showing bands of scores (e.g 50-59, 60-69), how many people got that score, and whether they got an offer, got interviewed but didn't get an offer, or didn't get an interview.

For 2014, around 55-60 people got between 80 and 89 (and 50 got between 90 and 100). For those getting between 80 and 89, all of them were interviewed, and around 40 of them were given offers (and around 40 getting 90-100 got offers as well).

In short, you've got a really good chance of getting a place with a score of 81 in 2014. But it's not guaranteed - there's quite a few people getting 90+ that didn't get a place, and even somebody who got between 30-39 got a place. Really, it depends on how low grades you're talking about, and what qualification they are. But with that sort of score it's pretty likely you'll get an interview at least.

For doing the 2015 paper, I'd maybe do it a week or two before the exam. That gives you time to evaluate where you've done well, and to really understand where you've gone wrong. 2015 was seen to be a very difficult paper, so it'll be really good preparation for whatever comes up this year.
14. I'm joining the thread. To say I am frightened by the test would be an exaggeration, but I am worried as I have not studied everything I need for it. Keep in mind I found out I need to take this exam in mid-September. Are you all applying to Oxford?
15. (Original post by lewman99)
Congrats, those are really good marks.

For more recent exams (I believe 2010 onwards?), there are examiner reports on the website, below the test solutions. They give you a breakdown of how many applications and offers were made to each course.

In a few of those (including the 2014 paper), there's a graph showing bands of scores (e.g 50-59, 60-69), how many people got that score, and whether they got an offer, got interviewed but didn't get an offer, or didn't get an interview.

For 2014, around 55-60 people got between 80 and 89 (and 50 got between 90 and 100). For those getting between 80 and 89, all of them were interviewed, and around 40 of them were given offers (and around 40 getting 90-100 got offers as well).

In short, you've got a really good chance of getting a place with a score of 81 in 2014. But it's not guaranteed - there's quite a few people getting 90+ that didn't get a place, and even somebody who got between 30-39 got a place. Really, it depends on how low grades you're talking about, and what qualification they are. But with that sort of score it's pretty likely you'll get an interview at least.

For doing the 2015 paper, I'd maybe do it a week or two before the exam. That gives you time to evaluate where you've done well, and to really understand where you've gone wrong. 2015 was seen to be a very difficult paper, so it'll be really good preparation for whatever comes up this year.
But how abt if i am applying for imperial? R there similar stats? Maybe i overlooked but i cant rly find it. Also, imperial didnt specify the minimum grade requirement include math or not coz I am taking HKDSE. Does anyone know the ans? Thx a lot
16. (Original post by RichE)
What graphs? Do you mean the lines x+y = constant, and curves xy = constant?

You can see from them how x+y increases. The largest value x+y can take is the value taken on the last line to intersect Q.
sorry forgot to specify. i think i get the x+y graph part how it corresponds to the y-intercept hence i guess the max would be the last line of gradient -1 that touches the quarter of the circle? what i dont really get is the next few graphs and the corresponding questions.
17. (Original post by danielhx)
sorry forgot to specify. i think i get the x+y graph part how it corresponds to the y-intercept hence i guess the max would be the last line of gradient -1 that touches the quarter of the circle? what i dont really get is the next few graphs and the corresponding questions.
Yes, the bold is right.

Well the next ones are hyperbolae, can you sketch those?

And if you think about it you only need those hyperbolae to answer the rest of the second part.
18. (Original post by RichE)
Yes, the bold is right.

Well the next ones are hyperbolae, can you sketch those?

And if you think about it you only need those hyperbolae to answer the rest of the second part.
yeah i've managed to sketch those. I'll probably have a go at it again later when i'm back. Thank you very much, sorry for the trouble!
19. I did the MAT 2014 paper and on question 1, part (j), I was confused about why can be integrated to . In fact, the entirety of the answer confuses me, really. Can anyone explain it to me in a simpler way than the Oxford solutions do?
20. (Original post by ShatnersBassoon)
I did the MAT 2014 paper and on question 1, part (j), I was confused about why can be integrated to . In fact, the entirety of the answer confuses me, really. Can anyone explain it to me in a simpler way than the Oxford solutions do?
Actually, Oxford's solution is quite trivial except that it didn't explicitly specify that
is a constant (but it shouldn't be hard to deduce that), hence the integral can be treated as a number when integrating.

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