If I was expelled from the 2nd course and I study again, is it the first or second...

No, all the same the first.

Second higher education is education obtained at the second level of higher education as specialized training and improvement of a person's professional training by deepening, expanding and updating his professional knowledge, abilities and skills or obtaining another specialty on the basis of a previously obtained educational degree (educational qualification level ) and practical experience with the award of a master's degree. A second higher education is obtained at a bachelor's and master's degree in another specialty.