Hi, I did a 1 year art and design access course then applied to Cov. From my personal experience the guy who reviewed my portfolio (I think his name was Neil Birtley) said he was only interested in my design work and not the fine art stuff I'd done, he was more interested in my black and white line sketches.
You're portfolio is what sells you so gotta keep drawing and work on it in your spare time.
The advice your teacher gave you not to draw cars is not good advice as thats how you learn to draw them, he should have told you not to only draw cars. Everything I learned about vehicle design and sketching were from books, dvd's, tutorials and showing some of my work on these forums for crits and advice, it helped alot.
As for grades Cov said my conditions were for me to have an A-C gcse in english and maths and at least 60 credits from the access course I was on.
If your a mature student and don't have these grades you can do the Learn Direct keyskills 3 online course in english and numeracy as they said they accept these as Equivalents.
Oh and another thing, don't only show you can draw cars in your portfolio, show you can draw different kinds of transport like trains, boats, helicopters and futuristic vehicles.
Also show your sketch work in an A4 portfolio and your tighter/finished work in an A3 one,(I did 5 A3 pages in black and white and 4 in colour with about 30 pages of A4 sketches in 2 seperate portfolios) don't add too many final colour renderings, show the process of how you ended up with them and show more sketchbook work (pens, prisma pencils etc)than final rendered stuff. Show some coloured renderings done in photoshop as well as traditional media.
Hope that helped,
John.
