Should I withdraw from calculus?

We finished taking our first test, and I received a terrible 4 out of 25 score. The course is 5 weeks long. If I calculated correctly I would have to make an overall grade of an 80 on online homework, and possibly low 90s on the second test and the final.
Both test 1 and 2 are 25% of my grade. The final is 30%, and online homework is 20%. I thought I would pass after studying 30+ hours for the first test…If I do withdraw it will be my first time.