You can get IMO level 2 for class 3rd sample papers through the IMO official site (the link will be provided below).

https://www.sofolympiadtrainer.com/imo-2nd-level.jsp

Coming to the syllabus will be :-

Patterns, Analogy and Classification, Alphabet Test, Coding-Decoding, Ranking Test, Grouping of Figures and Figure Matrix, Mirror Images, Geometrical Shapes, Embedded Figures, Days and Dates & Possible Combinations, Numerals, Number names and Number Sense (4-digit numbers), Computation Operations, Fractions, Length, Weight, Capacity, Temperature, Time, Money, Geometry, Data Handling and Mathematical Reasoning.

Abhishek, the syllabus for level 2 IMO is the same as level 1. Although while you may have questions from the previous class's syllabus in level 1 (about 40%), the level 2 syllabus will comprise of the full syllabus of this class only. The question paper pattern is also same. There is only a little increase in the difficulty level of the paper.

While the question papers of 2nd level are not released officially by SOF, you can practice for it through previous year papers of level 1 and sample papers of level 2. You can find the question papers on the link: https://school.careers360.com/articles/imo-sample-papers/amp

You can solve the SOF IMO books by MTG for preparation. You can also go through the below link to get IMO workbook, reasoning workbook, practice test papers and past years' papers: http://www.sofworld.org/imo/class-3/books-and-additional-reference-books-class-3

For detailed syllabus, you can go through: http://www.sofworld.org/imo/class-3/imo-syllabus/imo-syllabus-class-3