Planning to resign after 50 days need suggestion - Java developer 1.8 years of experience.

Hi Everyone, I am java developer with 1.8 years of experience planning to resign after 50 days my notice period is 90 days. Need a suggestion on preperation for interviews. My current stack is java struts 2,JSP and MS sql. Please give your valuable suggestions and share your experience.

According to current market what are the topics should I learn ?