Most Efficient C# SharePoint List Iteration?

I'm doing some custom code for a SharePoint webpart in C#. Specifically, I'm making a quiz, my main point here addressing the list that holds the question, answer choices, and correct answer.

At the last stage of the quiz I need to check the answers selected by the user against the correct answer in the list. Currently, I'm doing the following to check if each is correct, which I'm assuming isn't very efficient because it iterates through each question. Is there a method, specifically for the SPList foreach loop, that would be more efficient?

// 1. Store questions and answers in class
List<submittedAnswers> answeredQuestions = new List<submittedAnswers>();
// 2. From POST pull answered question IDs and answer IDs (which correspond to the question primary key and answer choice number both stored in the list)
// INSERT BEAUTFIUL AND EFFICIENT WHILE LOOP HERE
// 3. Loop through each question is list, if question was given, test if correct/incorrect
using (SPWeb myWeb = mySite.OpenWeb())
{
SPList answerList = myWeb.Lists[questionList];
foreach (SPListItem quizEntry in answerList.Items)
{
int pullAnswerId = int.Parse(quizEntry["Answer"].ToString()); // Pull answer number from list
int pullQuestionId = int.Parse(quizEntry["ID"].ToString()); // Pull primary key of question
submittedAnswers result = answeredQuestions.Find(delegate(submittedAnswers e) { return e.questionId == int.Parse(quizEntry["ID"].ToString()); });
if (result != null)
{
if (result.responseId != pullAnswerId) // If the response was different from the answer
incorrectAnswers++;
else
correctAnswers++;
}
}
}
// C# quiz grading magic here....