Hello,
I understand your frustration on failing to pass in any entrance exam for class 11th CBSE. However, I recommend you to continue with your current school, if you have not taken TC from there, and continue your class 11th from ISC board itself because it doesn't really matter which board you are in because majority of the syllabus is same class 11th onwards. In case you still wish to go for class 11th in CBSE board, I recommend you to connect with more schools who can offer admission based on academics or by giving more entrance exams.
Hope this helps,
Thank you
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile