Hello,
Junior Basic Teachers Entrance Exam ia conducted for admission to two years of junior basic training course. Variohs educational institutes conduct their own JBT exams. Afyer completing the course the candidates are eligible to apply for teaching jobs at junior level.
The eligiblity criteria for JBT exam is class XII, so YES, you are eligibile to for the exam.
There is no direct entry, you need to clear the exam to secure the admission.

Good luck