Is it permissible to alter Baccalaureate grades, including hacking the website, forging the certificate, or bribing an employee, in order to obtain external scholarships required by a legitimate necessity, especially since the desired specialization is unavailable in the country?

The basic ruling concerning piracy, forgery, bribery, and similar actions is that they are forbidden. If the scholarship conditions require achieving certain grades, then this condition must be adhered to, and one should not defraud.

However, if you are certain that you have been unequivocally wronged in the grading, and there is no way to rectify this injustice except by defrauding to adjust the marks to no more than what you deserve, even if it involves paying a sum, then there is no sin upon you in that. This is because forbidden bribery is for establishing falsehood or nullifying truth, which is contrary to the case mentioned. All of this is conditional on being certain of the occurrence of unequivocal injustice; otherwise, the basic ruling is prohibition. Your self-assessment of your level without the exam is not reliable.