Hello Tarun,
Top foreign universities (the Ivy Leagues in the USA, Oxford/Cambridge in the UK) take into consideration more than your exam scores. Also, there are other tests you will have to sit for, like the SATs/GRE/IELTS to qualify for colleges, whose scores will be more important.
Having said that, having good board marks would definitely have helped but you can compensate with outstanding co-curriculars like public speaking/community service/having a startup venture of your own.
Dear there are no direct admission for foreign university basis on percentage.GRE test is entrance test for admission.
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