What should I do if I am weak in mathematics but want to study AI ?

Being weak in mathematics does not automatically mean you should give up on AI. It does mean you should be prepared to strengthen your foundation. Start by revising algebra, equations, functions, percentages, graphs and basic probability. Practise a little each day and solve questions instead of only watching explanation videos. As you become comfortable, move towards statistics and the mathematics included in your degree syllabus. Try connecting mathematical ideas to simple programming exercises so that you understand how they are used. At the same time, check the mathematics requirements of the course you want to join. Some programmes are more mathematically intensive than others. The key is to be realistic about the effort required and give yourself time to improve.