In England, 40% of A-level papers were marked online. One board, Edexcel, says all its papers will be next year.
But the Qualifications and Curriculum Authority said technology should make assessment easier.
Teachers at Tolworth School, in Surrey, say they had sent back unprecedented numbers of papers to be re-marked this year as they were shocked at the grades many A-level and GCSE students received.
Student Katie Davison thinks she was affected.
She said: "I got two As and a D in the third paper which was completely unexpected and I was not happy with it at all but it means that I can't go to university with that D grade."
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