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

1. (Original post by Mr M)
I've looked now. Are there any questions that people are unsure about and would like a second opinion on?
Question 10iii) I used RHS of the identity to show that it equals to LHS, will i drop all the marks?

Also that question to integrate by substitution, I integrated it correctly, but I left it in terms of u, how many will I drop?
2. (Original post by JoshL123)
How many marks do you reckon I would lose for reading it an directly proprtional isntead of inverself proportional? All 7 and then the 2 on the next one :/?
Possibly 5 out of 7. Maybe follow through ones too?

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3. (Original post by gregzz)
Question 10iii) I used RHS of the identity to show that it equals to LHS, will i drop all the marks?
I really doubt that you'll drop any of the marks because you still proved the identity.
4. Think I've got about 42/72
5. (Original post by Namige)
Sorry, are you talking to me?
what other user has such a sillly username?
6. Did anyone else get 7 root 78 for volume of pyramid one?
7. (Original post by ryankerr21)
Possibly 5 out of 7. Maybe follow through ones too?

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I'd say he'd get a few more. Drop 3 perhaps, since I think s/he'd get about 4 for separating the variables, attempting and correctly integrating their (albeit incorrect) differential equation, and then for also getting values of k and c that are correct according to his DE.

Of course it all depends if the A marks have an 'ft' (follow through) next to them in the mark scheme, if they do s/he should get a fair few. But wont get any early 'M' marks since your method of finding the DE was wrong.

For the volume he'll definitely get 1 assuming correct method, and I'd presume the second as long as its accurate according to their DE.

As the mark schemes say , they are there to help mark 'incorrect solutions' and I'd assume the second part would carry ft marks.

Hope that's a bit more encouraging!
8. (Original post by printergirl)
what other user has such a sillly username?
Dunno, never heard of 'Nimige' so I can't really comment.
9. (Original post by Mr M)
I've looked now. Are there any questions that people are unsure about and would like a second opinion on?
For Q4, it i only got two coodinates, (pi/2,1) (pi/6,1.5) but missed the other one, how many marks do i lose?

For Q7i) Would i lose a mark for putting the acute angle of 8.68 degrees?

For Q9, i simplified my dy/dx wrong and ended up with part 9ii) as t = 1 with (-2,-1) but wasnt sure about determining the nature, how many follow through marks will i get?

For 10iii) i didnt show the given expression but i expressed the first 4 terms instead of 3 correctly, how many marks lost?

Thank you!
10. I'm thinking about 51/52 for an A, does anyone think it would be much higher than that?
11. (Original post by alastair999100)
For 5 ii):

I got completely the wrong integral, but still put limits in and presented my answer in the form AlnB

How many marks would I lose? (/5)
LOL
12. (Original post by .....p.....)
Did anyone else get 7 root 78 for volume of pyramid one?
Yes!!!!!!!!! I did
13. (Original post by rajiv.dua07)
Yes!!!!!!!!! I did
I did too! Are we right?!
14. Grade boundaries for a D anyone????? :'(
15. (Original post by .....p.....)
Did anyone else get 7 root 78 for volume of pyramid one?
No I think you would have lost 13 marks
16. (Original post by alastair999100)
No I think you would have lost 13 marks
At least I didn't screw up the integral question. That's got to be an automatic rejection from university?
17. 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
18. (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
What would grade boundaries be for a D?
19. (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
Why would the paper not be marked out of 72

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20. (Original post by printergirl)
are you mr m's disowned son because you didnt get 100 ums in maths?
pahahahahaha burst out laughing to this :')

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