Hi,
The eligibility criteria for Diploma courses is class 10th, now if you have completed class 10th and are interested to go for diploma you can apply for this.
Now, automobile is one of the most pursued degree as everyday development in the automobile industry calls for more young professionals in the field who are enthusiastic about the work. There is major growth and requirement for automobile and diploma in automobile can provide you with that. After your diploma you can also go for completing your B.Tech in Automobile.
You can refer to this link for more details: https://www.careers360.com/courses/automobile-engineering-course
I hope this helped you
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