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# OCR C4 (not mei) 18th June 2013 revision watch

1. (Original post by missypink<3)
What page is the unofficial mark scheme on?
http://www.thestudentroom.co.uk/show....php?t=2384831
2. (Original post by mykho1)
I don't think that was a straightforward paper at all.. but June 2012 was no doubt harder. I actually requested my marked paper scanned back, and guess what guys..? It was marked out of 72... meaning an A* mark would have been 65... So I am really not feeling optimistic about this at all. I'm from Winchester College, and majority of the subjects have already changed to Pre-U instead of A-levels. And because of the introduction of the supposedly ''MUCH'' harder pre-u exam, a levels have felt the need to tighten up, hence the unexpected jump in BOTH difficulty and grade boundaries for last year's C4. I expect them to keep it similar, so that would mean like a 64 for A* and a 57/58 for an A.......

I'm just being realistic here guys
It was 64 for an A* in C4 in June 2012.
3. (Original post by Banoffeepiee)
Thank you but I have realised I made another silly mistake,
When I integrated 1/k I stupidly put Kt, so when I subbed in the t/r value and the k value I found from the dr/dt equation, I got the final equation wrong, how many marks would I loose?
For part ii) would they mark it based on your equation to part i)

tha
You'd probably only lose 2 in total.
4. (Original post by XingBairong)
7ii) I did t the same and I'm guessing 0 unless they give you one for timing it by the right height? 0 or 1 but more likely 0 :L
You'd probably get the 1 mark for AD.
5. Does doing d^2y/dx^2 on 9ii rather than considering dy/dx on either side lose you a mark? Or would they allow it..
6. Reckon I got 60 raw marks, any ideas how much ums this will be roughly?

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7. (Original post by Amazing Al)
Reckon I got 60 raw marks, any ideas how much ums this will be roughly?

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Probably 87-91

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8. (Original post by tooambitious)
Probably 87-91

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I need 90 UMS for A*. Unfortuantely I reckon I got 61... so very tight. I'm blaming you tooambitious if I dont get the A* and you're prediction is wrong .

(In other words, please god let you be right.)
9. (Original post by mykho1)
I don't think that was a straightforward paper at all.. but June 2012 was no doubt harder. I actually requested my marked paper scanned back, and guess what guys..? It was marked out of 72... meaning an A* mark would have been 65... So I am really not feeling optimistic about this at all. I'm from Winchester College, and majority of the subjects have already changed to Pre-U instead of A-levels. And because of the introduction of the supposedly ''MUCH'' harder pre-u exam, a levels have felt the need to tighten up, hence the unexpected jump in BOTH difficulty and grade boundaries for last year's C4. I expect them to keep it similar, so that would mean like a 64 for A* and a 57/58 for an A.......

I'm just being realistic here guys
june 2012 was a considerably easier paper. Sorry :')
june 2012 was a considerably easier paper. Sorry :')
Exactly, the only hard question on that paper was integrating lnx and the rast of them were gift marks
11. (Original post by sj_1995)
I need 90 UMS for A*. Unfortuantely I reckon I got 61... so very tight. I'm blaming you tooambitious if I dont get the A* and you're prediction is wrong .

(In other words, please god let you be right.)
for you

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12. Didn't realise June 12 was so low, in which case I'd say 61 is easily A*
13. Can I kill myself now please?
WHAT IS EVERYONE SAYING AN A IS??? GRADE BOUNDARIES FOR AN A???????

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Can I kill myself now please?
WHAT IS EVERYONE SAYING AN A IS??? GRADE BOUNDARIES FOR AN A???????

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I hope:

A* - 60
A - 53
B - 46
C - 39
D - 32
15. (Original post by Namige)
Does doing d^2y/dx^2 on 9ii rather than considering dy/dx on either side lose you a mark? Or would they allow it..
I did the same, d^2y/dx^2 just considers the gradient on either side right?
16. (Original post by .....p.....)
At least I didn't screw up the integral question. That's got to be an automatic rejection from university?
You joke but it may as well be :L
17. (Original post by JASApplications)
I hope:

A* - 60
A - 53
B - 46
C - 39
D - 32
Considering June 12 boundaries were lower, I say take two marks off everything there

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18. (Original post by tooambitious)
Considering June 12 boundaries were lower, I say take two marks off everything there

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june 2012 was 57 for an A :P But I reckon an A will be about 52.
19. (Original post by ttylerbevann)
I did the same, d^2y/dx^2 just considers the gradient on either side right?
Kind of, it just determines directly whether it is a max or min.
20. (Original post by ttylerbevann)
I did the same, d^2y/dx^2 just considers the gradient on either side right?
It tells you the rate of the rate of change of the gradient, so whether or not the gradient is increasing or decreasing.

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