I want it for Andaman climate, hot humid and rainy

For Andaman, Malabari is the safest choice. It handles hot, humid, rainy weather well and is a strong meat breed with good twinning. If you want milk too, Beetal can work, but only with dry bedding, shade, and good ventilation. Avoid weak, heat-sensitive stock. If you are buying, check for a healthy coat, clear eyes, and no cough or loose dung. If you want, I can help you shortlist the right goat type for your island setup.