hi,

yes, the PSU's recruit through the gate exam.the organisations like ISRO ,AIF will recruit the freshers through gate exam only.for that you've to follow the job openings in such a organisations.you should follow the job news and websites,subscribe them to give you the alerts of job openings.

for eg:

freshersworld website will help you

I Hope this information will be useful to you.

if you need additional information,let us know to help you.

Thank you!!!:)