B1 can be handled if you have a planned preparation and regular speaking practice.
It depends on learning capacity of students, usually, it takes 2.5-3 months of full-time focused study.
Self-study is good but professional helps maximises exam success.
Usually, people find speaking the most difficult because they lack practice and are not confident.
Practice tests are useful. They help in managing time and adapt students to the exam patterns.
Most learners get the best result using a hybrid method, especially for speaking practice.
