Hi aspirant,

If you upgrade to IBT,you need not write both.You should write IBT and consider that score.

If you have applied for both CBT and IBT,appear for both the exams and check in which you are securing high composite mark and percentile.You can consider that score while applying for college and its completely your choice while uploading the documents in the application form.

And you have to apply for each college separately after MAT exam.

All the best!