Do the work.

Squats. Singles at 90%. 
When I first started working with my current coach, I really didn’t care for squatting days much because I was so bad at it (although I didn’t realize it at the time), and I would try and hurry through them by doing as little warm up sets as possible. Now I actually have really come to enjoy these squatting days and doing all of the warm up sets.  I wish I would have done that sooner, spent extra time with the lighter weights and focusing on getting quality reps in.  Strength is a skill, and like any skill, it takes time to develop it, often years.  Everyone enjoys those newbie gains where PR's occur almost every time you touch the bar.  It is after that where the dedicated practice comes in, the process.

A coach can program for weaknesses but you have to be willing work on the weakness yourself by doing the extra work, spending the extra time to do work at the light weights accumulating quality reps before you tackle the heavier weights. 

Does your coach actually care about improving your weak areas?  Do they make sure that you understand the program that they wrote for you?  Did they even write you a program?  And if all of these things are a yes, what about the effort that you are putting in.  A friend just passed along this quote: 

"You don't rise to the level of your goals, you fall to the level of your preparation." James Clear

I'd like to squat 100kg.  I won't get there by seeing how fast I can throw weight on the bar.  I will get there by preparing my body with proper movement patterns and developing strength in the proper positions.  It is through the work of aligning these pieces that I will develop the overall strength to move the weight.  But it will take time.  It will be a process.  And the process of learning to be stronger is my actual goal.