With 75% in 12th and 43% in JEE Mains, getting admission in VIT AP is possible because VIT mainly considers 12th marks for admission, especially if your JEE score is low. VIT has its own entrance exam (VITEEE) or direct admission based on board marks. You can also try other VIT campuses like VIT Vellore or VIT Chennai, where 12th percentage plays a big role. So yes, you have a good chance to get admission in VIT through your board marks.