Hey as per my idea doing advance diploma in core java from ISM University of skills Chennai is good option and here I am giving you its details

Duration
Course is of 2 Months, Full Time, Diploma

Eligibility
Candidate must have passed 10+2 examination

Skills required
Candidate must have knowledge about Core Java Programming.

Other course offered
Certified Course on APACHE STRUTS 2, 48 Hours
Advanced Diploma in J2EE, 2 Months
Certified Course on Java Spring MVC, 32 Hours
Certified Course on Hibernate ORM, 48 Hours
Certified Course on Hadoop Administration, 48 Hours
Certified Course on Hadoop Development, 60 Hours
Advanced Diploma in Software Testing, 75 Days
Certified course on Manual Testing, 40 Hours
Certified Course on Selenium, 150 Hours
Certified Course on QTP, 75 Hours
Advanced Diploma in Android Application Development (ADAAD), 100 Hours

Address:
ISM University of skills
88 , W-Block , 2nd Street ,
2nd Avenue ,
Anna nagar East,
Near Annanagar roundtana ,
Near Tower Club ,
Opp VIT admin office.,
Chennai,
Tamil Nadu 600040
Phone:094484 74282