I am a btech 2nd yr student from electronics n communication branch.I WANTED 2 know for my summer training wich course should i opt for?

Pls help me with my query whether i should go for embedded systems,CCNA or VLSI .wich course certification will help me in future during placement n provide me with full knowlwdge. as my 2nd yr have come to an end,i want to utilize my holidays in a fruitfull way . so i want ur advice.