Take a deep breath and work out a timetable. After Easter it's a short week, then only 4 to the whit holiday. After that it's the last half term to the end of the year. If the workload is getting on top of you either speak to your school mentor, uni mentor or have a week off sick to catch up. Don't quit now, you really are too close to the end, teacher training is gruelling but if you can get through this you will fly next year when the pressure is off.