Tip 1 : Bookmark the GFG Google Archives. It helped me a lot during my preparations. Reading other’s interview experiences is one of the best ways to get yourselves ready for the next job interview. Practice daily atleast 5 questions.
Tip 2 : Most commonly asked topics in Google Interviews ( as per the mail I received from my recruiter ) :
BFS/DFS/Flood fill, Binary Search, Tree traversals, Hash tables, Linked list, stacks, queues, two pointers/sliding window
Binary heaps, Ad hoc/string manipulations.
Tip 3 : Highly recommended sites for practicing questions ( usually practice medium and hard level questions) :
Leetcode (highly encouraged)
Geeksforgeeks (highly encouraged)
CodeZen( highly encouraged)
Codeforces
Tip 4 : This is a great bigocheatsheet that could be of great help

Tip 1 : Mention past working experience in detail as how you were important to your previous company.
Tip 2 : Try to keep your resume to 1 page if work experience < 5 years
Tip 3 : Update your resume according to role you are applying for and never put false things on resume.