Coding
I would suggest starting with either of the following:
Consistency is key here, you should aim to finish these in ~2 months. Then based on the company you are interviewing for you can try to practice company tagged questions on Leetcode. Ensure that you are timing your practice sessions.
System Design
This interview is usually used to determine levelling.
Preparing for system design interviews.
Behavioral Interview
These interviews are usually used to determine levelling for the role.
I recommend reading through Hello Interview’s Behavioral coursework.
For Frontend specific preparation you can use this guide.