Hello Student  Your brother

Is doing general machinist course he can do it after 12th class. After 12th class the better course of general mechinist go   for JEE mains and take the course of mechanical engineering. After 12th through jee mains and through some important entrance test BITSAT,EAMCET,BCCE WBjee, your brother can join any comment college of your state for engineering and many reputed private colleges for engineering. The most rewarding courses in engineering are mechanical, electrical civil, electronics and communication engineering, electricals and electronics engineering. All these courses admission is possible through jee mains in NITs or iit's or GFTIs.

Hope this helps.