Will my A-level results ruin my chances?

Are my bad A-level results going to jeopardise my chances of landing a top city firm training contract?

In September I will be entering my second year of my law degree, and am all geared up to start vac scheme and training contract applications. I seem to be doing quite well at uni so far, but I am now panicking that my bad A-level grades are going to jeopardise my chances of getting a job at a top law firm. Will I be subject to the initial elimination process that I know grad recruiters do to trim down applications? What can I do to avoid this happening?