I'm in 10th class students

I take basic maths

But now I want standard math

Students who opt for Basic Mathematics are not eligible to study Mathematics in upper classes, while students with Standard Mathematics can study this subject in higher classes. The questions asked in Basic Math are much easier compared to those in Standard Math. Complete questions in basic math can be attempted if a student pays proper attention to NCERT. Whereas, questions in Standard Math require higher order thinking skills.If a student has passed the CBSE Class 10 Board Exam with Basic Mathematics and wants to change it to Standard Mathematics; After the declaration of the result, you are allowed to fulfill a condition. To change from Basic Math to Standard Math, a student must pass the Standard Math Sharing Test conducted by CBSE. After passing the Standard Mathematics Compartment Exam, students are eligible to study Mathematics in upper classes.

I hope this answer helps. All the very best for your future endeavors!