Simultaneous elections refer to the concurrent holding of elections at national & sub-national levels, i.e., state & local bodies.

India used to have simultaneous elections during 1950s & 60s but with political instability, these got out of sync.

Simultaneous elections: As step towards reforming electoral process & governance:-

So, this could also be checked

Election expenditure by political parties would also come down leading to secrecy of black money & other $ malpractices also

However, few issues as well :-

Nevertheless, govt has recognized the importance of simultaneous elections & has accepted recommendations of former President Kovind committee, Constitution Amendment bills introduced for its implementation for are under consideration by parliament. Their early passing can ensure smooth implementation.