I was wondering if you could drop some tips or topics that we should know. Especially for Maths

As for tips, I can't say anything for maths except for memorise concepts and formulas, practice a lot, and don't stress. For topics, probably study these:

1. Financial Mathematics - compound interest, depreciation, interest,

2. Algebra - Factorising

3. Surds & Indices - Index laws, rationalising denominator, negative fractional powers

4. Simultaneous Equations - substitution, elimination & Inequations

5. Linear Relationships - gradient formula, distance,

6. Non-linear relationships - quadratics, graphing

7. Rates and Proportion - direct proportion, indirect proportion, conversion of percentage to ratio

8. Trigonometry - pythagoras, exact values

9. Geometry - angles of squares, shapes, parallel lines

10. Statistics - interquartile range, average, median, mean, mode

11. Probability - venn diagrams, conditional, tree diagrams

12. Polynomials - division of polynomials specifically

13. Functions

14. Circle Geometry - the formulas, graphing

15. Kinematics - time at which 2 objects meet.

(These are from Di.Dact from here:

https://atarnotes.com/forum/index.php?topic=183784.msg1101561#msg1101561)