Please help which Branch I should take in engenering little weak in math but good in skill, interest in machine, tech, gadgets,invention.

As per your interest, you can go for study in artificial intelligence (AI) systems. It's a part of computer Science stream and somehow correlated with digital electronics. Not full but few math concepts are used in the AI logics which u can done easily. Artificial intelligence (AI) is the intelligen

engineering mathematics is a necessity for every branch, however the engineering mathematics is easy and enjoyable.you have to go through engineering maths for starting few semesters and then you will completely go through your branch in deep.