Hi aspirant,
According to the hsc mark provided by you,  your chances are impossibile to obtain a seat in government college under automobile department.  50%hsc mark is insufficient to obtain a seat in government college.  Therefore it is better to opt for A private college that offers automobile engineering.
Refer link to know about colleges offering automobile engineering https://engineering.careers360.com/colleges/list-of-automobile-engineering-colleges-in-india
Hope this helps
All the best