Hi dear candidate,
The Unit Test exams are completely held at the hands of your respective school, so you should contact you teachers about the commencement of UT exams.
You can prepare and practice from sources like NCERT Exemplar for Mathematics which is available with solutions at our official website:
NCERT Exemplar Class 9 Maths Solutions - Chapter Wise Problems with Solutions
BEST REGARDS
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile