I am a student who have finished class 12 recently and I want to find out which engineering is best for me. How can I do that?

Indeed, there are a wide range of disciplines - AI and Data Analytics, Electrical Engineering, Medical Science and Technology, Engineering Physics, Civil engineering, Metallurgy and so on. Going through the current curriculum in all these branches can give you a good idea of what might be the best fit for you. You can also check what types of professions graduates from these disciplines get into. If possible, you should try to meet and talk to some of them and understand what kinds of activities they are engaged in. This will give you a good idea if that field is interesting to you. If you pick a field that is interesting to you, there is a greater chance that you can contribute well in that field.