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hold on to your place at Warwick while your partner tries for a suitable alternative through Clearing - he may have to consider changing his course choice
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ask Warwick if they will let you defer for a year while he has another go (which, to be honest, is unlikely to succeed if he's already tried twice)
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withdraw from Warwick and start again with you both making a fresh application for 2020 start, but to other unis
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withdraw from Warwick because you both decide to get jobs for the time being and postpone higher education for now