C3 OCR Jan 2013 Preparation Thread!!

what resources did u use for M1 revision(besides papers)? i recommend maths247 on youtube he does all the further maths modules except decision modules.

Im going to start M1 revision possibly on sunday im hoping to get the physics and computing revision done at least in the next 2 weeks so i can start papers for them. 1st year physics was very very boring. 2nd year stuff very very interesting BUT concepts are very hard to explain and the exam is barely mathematical calculations about 80% of it is explain and apply 20% is maths proving formulas its insane haha.

I just used papers and the notes in the textbook, that was enough for me personally (the textbook has 2 extra "mock" exams you can do which is nice). That and co-orporation with fellow students and the teacher was what I did.

Maybe you can do certain questions from other exam boards if you are really desperate for more work (I say some as of course each board does slightly different things)

EDIT: Made an OCR M2 thread if anyone is doing that unit, hope an OCR S2 thread comes along soon, or i'll feel bad making two threads

haha make the threads its TSR its for learning xD

If nobody else is doing those units though it is no point

Is anyone else having problems with consistency? My marks are literally yo-yo-ing between less than 50% and over 90% in each past paper that I do. Yesterday I did the January 07 paper, found it incredibly difficult and ended up with 53% with no idea what I'd done wrong for most of the questions. Today I did the June 07 paper and only lost 8 marks (two of which I would probably have picked up when checking through my answers in the real exam).

I have no idea why I can't seem to maintain a consistent standard. Clearly the knowledge is there because I could do the paper today, but I'm having real problems with some of them. This happened with C2 as well- right up until the exam the past papers I did would alternate between a D and an A. It's really unnerving and disheartening and I don't have a clue what to do about it.

Please tell me I'm not the only one?

can any of you guys attempt June 05 C3 very last question im stuck on it

EDIT: After looking @ the mark scheme i figured out where i went wrong but i cant see how they got the final answer so someone please check..

Is anyone else having problems with consistency? My marks are literally yo-yo-ing between less than 50% and over 90% in each past paper that I do. Yesterday I did the January 07 paper, found it incredibly difficult and ended up with 53% with no idea what I'd done wrong for most of the questions. Today I did the June 07 paper and only lost 8 marks (two of which I would probably have picked up when checking through my answers in the real exam).

I have no idea why I can't seem to maintain a consistent standard. Clearly the knowledge is there because I could do the paper today, but I'm having real problems with some of them. This happened with C2 as well- right up until the exam the past papers I did would alternate between a D and an A. It's really unnerving and disheartening and I don't have a clue what to do about it.

Please tell me I'm not the only one?

Basically the argument is that if it doesnt meet y=x it cant meet its inverse since its inverse is the reflection in the line y=x

They then set f(x) = x as you could do IF it met the y=x line, then they use the discriminant as if the discriminant is < 0 there are no solutions (i.e. it doesnt touch the y=x line). Hence the solutions.



I don't have consistency issues, I think I stay within in the same 5% normally, unless there is one very hard paper. It all comes down to practicing imo

yeah i figured out those parts but i dont see how they got the values 2 and 14 because im getting totally different answers when solving

x = f(x) or x= f^-1(x)

can you post your solution for that part please? (that is if your getting the right answer)

well I assume you know to set f(x) = x right? since you are going to try and make f(x) touch the line y=x and then find the values of m for this to be impossible.

x = root(mx+7) - 4

(x+4)^2 = mx+7
x^2 + 8x + 16 = mx+7
x^2 + (8-m)x + 9 = 0

Using discriminant b^2 - 4ac, you get:

(8-m)^2 - 4(1)(9)

I've basically given you the answer now, just some rearranging and realising what the inequality must be etc.

Is anyone else having problems with consistency? My marks are literally yo-yo-ing between less than 50% and over 90% in each past paper that I do. Yesterday I did the January 07 paper, found it incredibly difficult and ended up with 53% with no idea what I'd done wrong for most of the questions. Today I did the June 07 paper and only lost 8 marks (two of which I would probably have picked up when checking through my answers in the real exam).

I have no idea why I can't seem to maintain a consistent standard. Clearly the knowledge is there because I could do the paper today, but I'm having real problems with some of them. This happened with C2 as well- right up until the exam the past papers I did would alternate between a D and an A. It's really unnerving and disheartening and I don't have a clue what to do about it.

Please tell me I'm not the only one?

Try using the previous part of the question.

I have no idea how they are related!

Try using the previous part of the question.

how is everyone's revision going?

Well, for C3 what I am told to do is go through these 100 questions from Mathsnet. oh and work through a C3 revision guide questions. I have not done too much on it because of Xmas etc. but I will work a lot more the next week or so

Transformation orders (i.e. when it swaps) are still confusing me, since we were not taught them due to being "too simple"

yes i agree on the transformations they are confusing u always have to figure out which one is correct hows revision for ur other two units? I havent started M1 revision or D2 revision yet tho i do plan on starting end of this week trying to get physics out the way