Hello,

No, you cannot directly apply for the 3rd year at the Indian Institutes of Science Education and Research (IISER) as a lateral entry from a B.Sc. program. IISERs primarily admit students at the first-year level for their integrated BS-MS dual degree programs. They do not typically have a process for admitting students directly into the 3rd year of their programs.

If you are interested in joining IISER, you would typically need to start from the first year through their admission channels, such as:

1. Kishore Vaigyanik Protsahan Yojana (KVPY) channel.

2. Joint Entrance Examination (JEE) Advanced channel.

3. State and Central Boards Channel (SCB), which involves an aptitude test.

If you want to continue with a similar academic path at IISER, you would generally have to restart from the beginning of their integrated program. However, you could consider applying for postgraduate programs (like MS or PhD) at IISER after completing your B.Sc.

It's a good idea to check directly with the specific IISER you are interested in for any updates or exceptions to their policies.

Hope it helps !