Yes sukhdeep he is manglik and it would be better while searching a aliance for him, the girl should also be a manglish to counterfit the dosh. Along with mangal, shani and ketu also poking there nose to delay his marriage. Give me some time will advice you the right remedy as i know few things your brother can’t be willing to do.
Don’t worry she will catchup slowly, her inteligency will be towards outside the study world. Just do balle balle……
GOD BLESS!!!
Srinivasa Temkar