I don't think so time if going to be a factor to separate two students if they tie on a mark. Even though I'm not 100% sure, but time won't be a factor to identify the better one for sure. Some of the factors to judge when it's a tie between two students are like their separate subject scores, or who made an early error like if your first mistake is in the 11th question and some one else with same score as yours has a mistake in 10th question, then you'll get a rank ahead of him. These are some of the factors which are looked in and time wont be a factor.

Thank-you.