First of all I was there in Bansal classes for JEE 2007 1 yr programme (Nucleus for 12th std. students programme for JEE 2007) so I know the pressure u are likely to face when u go there without any previous JEE prepn. I too did not have any base , so faced a lot of problems but eventually it took a lot of hard work and I got AIR 4945 on my first attempt. Some of my friends studying right from 11th fared better than me in JEE 2007 despite the fact that I am much more intelligent than them. I eventually repeated (didn't go to Kota ) and got AIR 1004 in JEE 2008.
I will suggest u to keep on preparing well but break the task into parts so that u face less pressure.
First aim for selection.
Then for 2000 rank. and then 1000. Directly aiming for 1000 will put unnecessary pressure on u. But I repeat keep on working hard and you will be much better placed.
You may also try Resonance coaching class (2nd best after Bansal)
Best of luck and hope u have a bright future ahead.