OCR Core 4 Tomorrow Watch

lufiaguy
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#21
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#21
(Original post by Mustard-man)
ocr a-level past papers are so hard to obtain!
Especially when you go to my school! All I have from them are the Solomon papers... can't even get a copy of the specimen paper because the OCR website is broken again!

[If anybody has electronic versions of some OCR C4 papers, please shout out!]
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hakking
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#22
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Yah Mustard man try the practice examination qs at the end of the OCR endorsed book( Neil and Quadling). Esp the vector ones. that'll make you more confident.
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Mustard-man
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#23
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(Original post by lufiaguy)
Especially when you go to my school! All I have from them are the Solomon papers... can't even get a copy of the specimen paper because the OCR website is broken again!

[If anybody has electronic versions of some OCR C4 papers, please shout out!]
Well our school did even teach us it properly (because we were rushed for time)
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Mustard-man
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#24
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(Original post by hakking)
Yah Mustard man try the practice examination qs at the end of the OCR endorsed book( Neil and Quadling). Esp the vector ones. that'll make you more confident.
Oh yeah, I completely forgot about them, thanks.
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lufiaguy
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(Original post by Mustard-man)
Well our school did even teach us it properly (because we were rushed for time)
We were very rushed for time - our core teacher was on sick leave for well over a month leaving us self-teaching C4, then came back and "covered" scalar vectors in about two lessons!!
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Head
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#26
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#26
(Original post by hakking)

6. A weed is growing across a pond, such that the rate of increase of the area, A, it covers is proportional to A. At time t = 0 days the area covered is 1 m2, and after 10 days the area is 9 m2. Find the area covered after 20 days.
81m^2?
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Mustard-man
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#27
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#27
(Original post by lufiaguy)
We were very rushed for time - our core teacher was on sick leave for well over a month leaving us self-teaching C4, then came back and "covered" scalar vectors in about two lessons!!
daim, do you go to the same school as me? :p:

Our teacher has some kind of bronchile infection, she didn't even know we hadn't covered scalar vectors and she covered it in 3 lessons .
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hakking
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#28
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No mate I got 25 m2 and that was right. ( Edit: it is proportional to root A (mathtype error))
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Head
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#29
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yeh i thought it was a bit simple
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hakking
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#30
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Meh C4 aint too much of a problem compared to M2. i am soo pooing my pants for the M2 exam.
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Head
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#31
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#31
yeh im hoping to get over 80% on c4 to leave me needing about 40% on m2, just incase it goes horribly
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Mustard-man
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#32
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(Original post by hakking)
Meh C4 aint too much of a problem compared to M2. i am soo pooing my pants for the M2 exam.
:ditto:

M2 is such a pen*s :mad:, I better get atleast a mid A or a high A for C4, therefore I'll only need a D in M2 to get an overall A for A-level maths.

Fingers crossed
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Mustard-man
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#33
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#33
(Original post by Head)
yeh im hoping to get over 80% on c4 to leave me needing about 40% on m2, just incase it goes horribly
lucky git
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john-boro
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#34
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#34
well he's gotta get 80% first :p:

I'm assuming that I got around 80% on core 3 (Thanks to ignus_reef who checked his answers afterwards) and so I should need about 60% on this. However, like many others I expect it to be really hard, which is annoying because you could end up relying on the grade boundaries going down, which introduces a lot of uncertainty
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stefwan
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#35
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#35
I can't do a single one of those soloman paper questions. I always just make so many mistakes when it comes to things like trig differentiation/integration. Like i don't understand why 3cos^2t differentiates to 6cost * -sint :s Implicit differentiation confuses me too and don't even get me started on differential equations :mad:
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heminder
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#36
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the comprehension will be my downfall...
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Mustard-man
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#37
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(Original post by john-boro)
well he's gotta get 80% first :p:

I'm assuming that I got around 80% on core 3 (Thanks to ignus_reef who checked his answers afterwards) and so I should need about 60% on this.
Yeah, I calculated that I got around 92% for C3, but this was assuming that the percentage in raw marks is roughly same as the percentage in UMS marks, which it usually is in maths. However, I am seriously afraid if everyone else found it easy. Like Jan 06's C4, the grade boundary for an A was 90% :eek: that's 10% more than the usual raw percentage for an A!!! Just hope the grade boundaries won't be as crazy, I think that quite a few of the weaker candidates messed up the integration involving the rectangle, cos that took a little bit of thinking if you hadn't done something similar to that. Also the long 8mark question, you could either do that question, or not.
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john-boro
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#38
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there were a lot of sneaky bits on that paper so I would hope that the middling candidates won't have done well enough to push to grade boundaries up

certainly it was harder than the infamous january core 4.
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Head
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#39
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#39
if jan was easy no doubt this will be ridiculously hard
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Head
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#40
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#40
(Original post by stefwan)
Like i don't understand why 3cos^2t differentiates to 6cost * -sint :s
you could use the product rule with u=3cost and v=cost

or just remember that you multiply by the power and the derivative of the original trig function then reduce the power by 1...or something like that

e.g. 4sin^4 x d/dx= 16sin^x cos x (i think)
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